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CBSE Questions for Class 10 Biology Heredity And Evolution Quiz 6 - MCQExams.com
CBSE
Class 10 Biology
Heredity And Evolution
Quiz 6
Say Yes or No. Is it important that offsprings from the same parent should have common traits?
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No
0%
Yes
0%
Maybe
0%
None of the above
Explanation
Siblings from the same parent can have different traits as they can occupy traits from either the mother or the father. Therefore, (a) is the correct answer.
F1 generation consist of ____________ offspring.
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Homozygous
0%
Strong
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Weak
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Heterozygous
Explanation
Every member of the F1 generation is heterozygous, the resultant offsprings produced are heterozygous having two different alleles each. Therefore, (d) is the correct answer.
Human baby will be a female, if its 23$$^{rd}$$ chromosome pair is
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XX
0%
XY
0%
YY
0%
XYY
Explanation
23$$^{rd}$$ chromosome pair in humans constitutes the sex chromosome. Y chromosome determines the sex in humans. The genetic makeup of a female is XX, whereas the genetic makeup of a male is XY.
Who came up with the idea of evolution?
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Mendel
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Morgan
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Charles Darwin
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None of these
Explanation
Charles Darwin came up with the idea of evolution of species with natural selection. Therefore, (c) is the correct answer.
According to Charles Robert Darwin all species were established from ______________.
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Uncommon ancestors
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Common ancestors
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Different individuals
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None of the above
Explanation
Charles Darwin established that all species of life have descended over time from common ancestors. He did not know about Mendels experiment on inheritance which would have helped him study his work more easily. Therefore, (b) is the correct answer.
Who proposed the hypothesis that life must have developed from the simple inorganic molecules which were present on earth soon after it was formed?
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Miller
0%
Urey
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Darwin
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Haldane
Explanation
J.B.S. Haldane, a British scientist, suggested in 1929 that life must have developed from the simple inorganic molecules which were present on earth soon after it was formed.
He speculated that the conditions on earth at that time, which were far from the conditions we see today, could have given rise to more complex organic molecules that were necessary for life. The first primitive organisms would arise from further chemical synthesis.
So, the correct answer is option D.
The Laws of Inheritance were proposed by _______________.
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Charles Darwin
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Robert Hooke
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Newton
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Gregor Mendel
Explanation
Laws of inheritance were proposed by Gregor Mendel and were known as Mendel's laws of inheritance. He was the first to introduce that characteristic of parents can be in cooperated in the offsprings of the next generation. Therefore, (d) is the correct answer.
The $$F_2$$ generation will show maximum percentage of __________ allele.
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0%
Single
0%
Recessive
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Dominant
0%
None of the above
Explanation
Three-quarters of the $$F_2$$ generation will have the dominant allele's phenotype. And the remaining one-quarter of the $$F_2$$ will have the recessive allele's phenotype. Therefore, (c) is the correct answer.
Genetic trait is represented by _______________
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Vowel
0%
One letter
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Two letters
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Three letters
Explanation
Each genetic locus is always represented by two letters. For example in the case of eye color, B represents brown eyes and b represents blue eyes which shows the resultant trait as Bb.
Therefore, the correct answer is option C.
In a monohybrid cross each parent should be ___________
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Heterozygous
0%
Dominant
0%
Homozygous
0%
Recessive
Explanation
Each parent is chosen to be homozygous. One parent is homozygous for one allele, while the other parent is homozygous for the other allele. Therefore, (c) is the correct answer.
Evolution in stages results in __________
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Human beings
0%
Modification
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Inheritance
0%
None of these
Explanation
The evolutionary process has developed over millions of years. Lineages evolved and split and modifications occurred gradually in stages. Therefore, (b) is the correct answer.
Which of the following factors can give rise to new species?
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Travel from one site to another
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Mating in the existing population
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Mating at different area of sub population
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Both A and C
Who described role of natural selection in speciation?
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Orator F. Cook
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Charles Robert Darwin
0%
J.B.S Haldane
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None of these
Explanation
Speciation is the term used for the development of new species by changes in population. Charles Darwin was the first to describe role of natural selection in speciation. Therefore, (b) is the correct answer.
What are the dissimilarities between birds and bats wings that makes them analogous?
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Function
0%
Size
0%
Structure
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None of these
Explanation
Though both use their wings for flying; the wings of bats are skin folds stretched mainly between elongated fingers. But, the wings of birds are a feathery covering all around the arm. This shows the difference in the structure of their wings. Therefore, (c) is the correct answer.
Traits which are similar but not related are called as ___________________
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Homologous
0%
Analogous
0%
Acquired
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Inherited
Explanation
Some organisms have traits similar to each other because of some reason but they are not related, like the wings of birds and bats which are used for flying purpose but they do not evolve from a common ancestor. Therefore, (b) is the correct answer.
What are inherited traits ?
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Traits that are acquired naturally in the body.
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Traits
that are
acquired after birth.
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Traits
that are
transmitted from the parents to the next generation.
0%
Traits
that are
acquired due to environmental conditions.
Explanation
The traits which are transferred by the parent to its offspring through the process of fertilization are called inherited traits. These traits are inherited before birth in the womb itself. For example, i
n humans- eye colour, hair colour, skin colour, freckles, dimples, etc.
Therefore, the correct answer is option C.
In an experiment on mice, the tails of the mice are removed by surgery and then allowed to mate. This will result in what type of progeny?
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With tail
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Without tail
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With tail but of medium length
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No progeny will born
Explanation
The progeny of mice will not be tailless because the removal of the tail cannot change the genes of the germ cells of the mice. This will not pass onto the next progeny. Hence, the next progeny developed will be born with a tail. Therefore, A is the correct answer.
Name the factors that cannot be considered as a trait which can be inherited by the progeny.
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Colour
0%
Size
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Length of hair
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Both A and B
Explanation
The length of the hair depends from individual to individual, this will not alter the DNA of the germ cells.
Hence, the length of hair is not a trait that can be inherited.
Also, the changes in non-reproductive tissues cannot be transferred; hence, the experiences of an individual during its lifetime cannot be passed on to the progeny.
Therefore, C is the correct answer.
Speciation is a _____________ process.
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Evolutionary
0%
Geographical
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Geological
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None of these
Explanation
Speciation is the evolutionary process by which new biological species arise. This gives rise to new species with variable traits. Therefore, (a) is the correct answer.
Mendel carried out his experiment on pea plant. He focused on which of the following traits?
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Shape of seed
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Colour of seed
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Both A and B
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Size of seed
Explanation
Mendel started his first experiment on pea plants.
During his attempt to study the inheritance he considered the colour and shape of the seed.
He concluded from his experiment that more than one trait can be inherited from the parent plant and transmitted further.
His pea plant demonstration became the foundation of the study of Mendelian Traits.
Therefore, (c) is the correct answer.
How many X chromosomes are present in a female?
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$$0$$
0%
$$1$$
0%
$$2$$
0%
$$4$$
Explanation
There are two X chromosomes present in a female. Sex pair of chromosome XX represents the female human.
Among the following which one is a hereditary trait?
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Eye colour
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Hair colour
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Blood group
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All of these
Explanation
Genes on DNA are responsible for carrying genetic information which is inherited from one generation to another.
The traits like eye colour, hair colour and blood group are controlled by the genes and hence, they can be inherited from one generation to another.
Therefore, the correct answer is option D.
I. Herpes is a hereditary disease.
II. Traits transferred from parents to offspring are called heredity.
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I and II both are false
0%
I and II both are true
0%
I is true and II is false
0%
I is false and II is true
Explanation
Herpes is a viral disease that is caused by the herpes simplex virus. It has no effect on the genetic makeup of an individual.
The passing on of characteristics genetically from one generation to another is heredity.
The ultimate unit of heredity is:
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Protein
0%
DNA
0%
Gene
0%
RNA
Explanation
In a cell, DNA is tightly packed into chromosomes that are then passed onto offspring. It is the gene that contains the actual information.
Thus, the functional unit of heredity is a gene. Gene is the segment of DNA that provides information for one protein. The proteins regulate the various characteristics of the body.
Thus the correct answer is option C.
Any heritable feature is a:
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Gene
0%
Character
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Trait
0%
Chromosome
Explanation
In biological terms, a character can be defined as any heritable feature that varies among individuals. For example, flower colour. Traits are the alternative forms of the character. For example, the purple or white colour of the flower are the traits.
How many X chromosomes are present in a male?
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$$0$$
0%
$$1$$
0%
$$2$$
0%
$$4$$
Explanation
There is one X chromosome present in a male. Sex pair of chromosome XY represents the male human.
Heredity is seen in ______
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Sexual reproduction
0%
Asexual reproduction
0%
Vegetative propagation
0%
All of the above
Explanation
Transfer of genetic makeup from one generation to another is called heredity. Genes are found on DNA and thus, all living beings have a tendency to transfer DNA during sexual or asexual reproductions.
Trait that masks the other trait is called _______ trait.
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Dominant
0%
Recessive
0%
Mutant
0%
Mask
Explanation
The trait that is always expressed and masks the effect of other traits is called a dominant trait. They are expressed in both homozygous as well as heterozygous conditions.
For example, T is for tall and t is for dwarf. If T is dominant to t, TT will be tall and Tt will also be tall.
So, the correct answer is option A.
A cross between two tall garden pea plants produced all tall plants. The possible genotypes of the parents are
I) TT, TT
II) TT, Tt
III) Tt, tt
IV) Tt, Tt
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III, IV
0%
I, IV
0%
I, II
0%
II, III
Explanation
If the offsprings produced are all tall plants, then the possible genotypes will be:
1. TT x TT (which will result in all tall plants with genotype TT)
2. TT x Tt (which will result in tall plants with genotype TT (3 plants) and one with genotype Tt (which will also be phenotypically tall).
Thus, the correct answer is option (C).
Read the two incidents given below.
Incident 1: A species of moth is preyed on by bats. Over hundreds of years, the moths develop a sophisticated pattern of flying when they hear the screech of a bat and which helps them escape danger. Other changes occur as well, when current moth mates with its ancestor moth, no viable eggs are produced.
Incident 2: A species of frogs is living in a pond near an earthquake fault line. An earthquake separates the frog population into two separate populations. After hundreds of years, the two population are not able to mate.
Based on the second incident, mating between two groups of frogs is not possible as they have now become different:
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0%
Populations
0%
Communities
0%
Species
0%
Organisms
0%
Amphibians
Explanation
Species is a group of individuals that can potentially interbreed to produce fertile offspring. The geographical isolation of two population prevented gene flow among them and accumulation of genetic variation with time diverged then into two different species which are no longer able to interbreed.
So, the correct answer is option C.
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