CBSE Questions for Class 10 Biology Heredity And Evolution Quiz 10 - MCQExams.com

A dihybrid for a qualitative trait is crossed with a homozygous recessive individual of its type, the phenotypic ratio is:
  • 1 : 2 : 1
  • 3 : 1
  • 1 : 1: 1 : 1
  • 9 : 3 : 3 : 1
Some green beetles appear among the red beetle because
  • Beetles become green by accumulating chlorophyll from the green leaves that they eat.
  • Natural variations occur during sexual reproduction.
  • Red beetles mimic green colour of leaves whenever they see crows.
  • Beetles change colour from red to green with change of season.
An inherited character and its detectable variant is termed as:
  • Unit factor
  • Trait
  • Genetic profile
  • Genotypic character
The colour composition of beetle population is likely to change in the following manner.
  • Both red and green beetles survive equally.
  • Only the red beetles survive.
  • More red beetles survive than the green.
  • More green beetles survive than the red.
Fill the blank circles in figure marked as A and B. Identify the sex of child A and B.

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  • A-Girl (XX) , B-Boy (XY) 
  • A-Boy (XY) , B-Girl (XX)
  • A (XX) and B (XY) both girl
  • A (XX) and B (XY) both boy
Match the following lists and choose the correct option.
List IList II
A. Genetic changes1. Homologous organ
B.Independent inheritance                     2.Fossil
C.Natural selection3.Analogous organ
D.Dihybrid ratio4.XY
E.Male human beings5.9 : 3 : 3 : 1
F.Wing of a bat and a wing of a bird6.Darwin
G.Remnant of ancient animals7.Mendel
H.Arm of a man and wing of a bird8.DNA copying
  • A- 8, B- 7, C- 6, D- 5, E- 4, F- 3, G- 2, H- 1
  • A- 8, B- 6, C- 7, D- 5, E- 4, F- 3, G- 2, H- 1
  • A- 7, B- 8, C- 6, D- 5, E- 4, F- 3, G- 2, H- 1
  • A- 8, B- 7, C- 6, D- 5, E- 4, F- 2, G- 3, H- 1
Variation combined with geographical isolation may result in _______.
  • Mutation
  • Speciation
  • Fossilisation
  • Genetic drift
A cross between a tall pea plant and dwarf pea plant resulted tall progenies in $$F_1$$ generation, because
  • Tallness is a recessive trait.
  • Dwarfness is a dominant trait.
  • Tallness is a dominant trait.
  • Neither 'T' or 't' governs stem height.
Select the incorrect statement.
  • Each character of an individual is controlled by a unit factor.
  • During gamete formation, the alleles do not segregate, so that each gamete receives both the pair of alleles.
  • The various forms of genes occupying a locus on homologous chromosomes are called alleles.
  • Locus is the position on chromosomes were genes are located.
Which of the following statements is/are correct?
  • Mendel's experiments gave us the mechanism for the inheritance of traits from one generation to the next.
  • Mendel's findings remained unknown until these were rediscovered.
  • Natural selection is based on the isolation of natural populations and selective breeding of organisms.
  • Both A and B.
A cross between $$AaBB$$ and $$aaBB$$ yields a genotypic ratio of:
  • 1 $$AaBB$$ : 1 $$aaBB$$
  • 1 $$AaBB$$ : 3 $$aaBB$$
  • 3 $$AaBB$$ : 1 $$aaBB$$
  • All $$AaBb$$
Speciation does not takes place due to ________.
  • Genetic variation
  • Reduced gene flow
  • Geographic isolation
  • Mutation
  • All of the above
Which statement about alleles is not true?
  • There may be several at a locus.
  • One may be dominant over another.
  • They occupy different loci on the same chromosome.
  • None of the above
The recessive state for seed coat colour is
  • Green
  • Grey
  • Yellow
  • White
Which of the following statement is true?
  • Mother determines the sex of the child.
  • Father inherits the character to the son only.
  • Father inherits the character to daughter only.
  • None of the above.
High degree of homology in the DNA of dogs and wolves is correctly describes by "Dogs and wolves share a very recent common ancestor"
  • True
  • False
Study the following and select the correct statements.

(I) $$F_1$$ progeny is the first hybrid generation and progeny resembled either of the parents.
(II) $$F_2$$ progeny is a resultant hybrid generation of cross-pollination among $$F_1$$ progeny and progeny showed both dwarf and tall plants.
(III)$$F_2$$ progeny is a hybrid generation, produced by selfing $$F_1$$ hybrids and progeny contained both dwarf and tall plants.
(IV) The proportion of probability of plants that dwarf was 1/4 that of the $$F_2$$ plants while 3/4th of the plants were tall.
  • I, II, III, IV
  • I, III, IV
  • I, II, IV
  • III, IV
With respect to the Darwin's theory of natural selection, which of the following is true for the organisms that are best suited to their environment?
  • Are most likely to evolve
  • Are most likely to survive and reproduce
  • Are most likely to live the longest
  • Are the fastest organisms
  • Have the same chance of survival as other organisms
'Feather was used for insulation in cold weather but later, they become useful for flight'. This statement describes:
  • Genetic variation
  • Speciation
  • Evolution by stages
  • All of the above
A group of laboratory mice having tails are bred together and their progeny is studied. The progeny had tails. However, scientist surgically removed the tails of the progeny and again bred them for four successive generations. What do you think would be the nature of the new progeny?
  • All mice born will have tails.
  • All mice born will have no tails.
  • The ratio of tail-less to tailed mice will be 1:3.
  • The ratio of tail less to tailed mice will be 1:4.
Phenotype is influenced by
  • Environment
  • Development
  • Ageing
  • All the above
Choose the correct answer from the alternatives given.
In tomatoes, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over dwarfness (t). A plant that is RrTT is crossed with a plant that is rrTt. What are the chances of an offspring being heterozygous for both traits?
  • None
  • 1/2
  • 1/4
  • 9/16
When a cross is made between a tall plant with yellow seeds (Tt Yy) and a tall plant with green seeds (Tt yy), what is true regarding the proportions of phenotypes of the offsprings in F1 generation?
Proportion of Tall and Green         Proportion of Dwarf and Green 
  • $$\dfrac{3}{8}$$ $$\dfrac{1}{8}$$
  • $$\dfrac{2}{8}$$ $$\dfrac{1}{8}$$
  • $$\dfrac{1}{8}$$ $$\dfrac{3}{8}$$
  • $$\dfrac{2}{8}$$ $$\dfrac{2}{8}$$
When a pure strain of tall plants (TT) with round seeds (RR) is crossed with a pure strain of short plants (tt) with wrinkled seeds (rr), an $$F_1$$ generation is produced. The alleles for short and wrinkled are recessive to those for tall and round, respectively. When these $$F_1$$ plants self-pollinate, what proportion of the $$F_2$$ generation is short with wrinkled seeds?
  • 0
  • $$\displaystyle \frac {1}{16}$$
  • $$\displaystyle \frac {1}{2}$$
  • $$\displaystyle \frac {9}{16}$$
According to the theory of acquired inheritance which one is correct?
  • If a man loses his hand, then his children will also be missing a hand.
  • Organisms are able to bring about a change in their phenotype.
  • Changes in phenotype are passed on by way of the genotype to the next generation.
  • All of the above
Homologous organs are:
  • Tails of bird, monkey and scorpion
  • Stings of honey bee, scorpion and fangs of snake
  • Wings of butterfly, flying fish and bird
  • Paddle of whale, front legs of horse and arms of humans
Homologous organs indicate:
  • No evolution
  • Parallel evolution
  • Natural selection
  • Common descent
Which of the following statements about natural selection are correct?
(i) Natural selection tends to increase the characters that enhance survival and reproduction.
(ii) Individuals with better adaptive ability will produce more progeny.
(iii) Was considered as a mechanism of evolution by Darwin.
  • (i), (ii) and (iii)
  • (i) and (ii) only
  • (iii) only
  • (i) and (iii) only
Experiment to prove that synthesis of organic compounds formed the basis of origin of life was performed by :
  • Oparin
  • Haldane
  • Miller
  • Fox
Darwinism explains all except:
  • Within each species there are variations.
  • Variations are inherited from parents to offspring through genes.
  • Organisms tend to produce more offspring than can survive.
  • Organisms with better traits that overcome competition are best suited under the environment.
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