CBSE Questions for Class 10 Biology Heredity And Evolution Quiz 8 - MCQExams.com

Both human beings and ________________ have a common ancestor a long time ago.
  • Chimpanzees
  • Monkeys
  • Gorillas
  • None of the above
Which one of the following statements is incorrect?
  • Alleles are different forms of the same gene.
  • Alleles are present at the same locus.
  • Alleles code for different isoforms of a protein.
  • Alleles are non-heritable.
Which of the following traits in humans you can easily study just by observing and making family charts?
  • Dimples
  • Tongue rolling
  • Ear lobes attachment
  • All of the above
An allele is said to be recessive, when it is expressed in:
  • Heterozygous condition only
  • Homozygous condition only
  • $$F_3$$ generation
  • Both homozygous and heterozygous conditions.
The cross TT $$\times$$ tt is a:
  • Test cross
  • Back cross
  • Monohybrid cross
  • Reciprocal cross.
Due to Starvation if beetles have low body weight then this character is transfer to the next generation or not it is based on __________.
  • Acquired trait
  • Inherited trait
  • Recessive trait
  • Dominant trait
Choose the correct answer from the alternatives given.

In mice, black coat colour (allele B) is dominant to brown coat colour (allele b). The offspring of a cross between a black mouse (BB) and a brown mouse (bb) were allowed to interbreed. What percentage of the progeny would have black coats?
  • 25%
  • 50%
  • 75%
  • 100%
Choose the correct answer from the alternatives given.

In a monohybrid cross between two heterozygous individuals, the percentage of homozygous individuals obtained in $$F_1$$ generation will be _________.
  • 25%
  • 50%
  • 75%
  • 100%
In a certain plant, yellow fruit colour (Y) is dominant over green fruit colour (y) and round shape (R) is dominant over oval shape (r). The two genes involved are located on different chromosomes.
Which of the following will result when a plant - YyRr is self-pollinated?
  • 9:3:3:1 ratio of phenotypes only
  • 9:3:3:1 ratio of genotypes only
  • 1:1:1:1 ratio of phenotypes only
  • 1:1:1:1 ratio of phenotypes and genotypes
Choose the correct answer from the alternatives given.

The given Punnetts square represents the pattern of inheritance in a dihybrid cross where yellow (Y) and round (R) seed condition is dominant over white (y) and wrinkled (r) seed condition.

YRYryRyr
YRFJNR
YrGKOS
yRHLPT
yrIMQU

A plant of type H will produce seeds with the genotype identical to seeds produced by the plants of
  • Type M
  • Type J
  • Type P
  • Type N
Choose the correct answer from the alternatives given.

A recessive allele is expressed in __________________.
  • Heterozygous condition only
  • Homozygous condition only
  • $$F_3$$ generation
  • Both homozygous and heterozygous conditions
A phenotype is the combined product of gene and of the environmental influences.
  • True
  • False
The members of the same biological species are potentially able to
  • compete
  • express all the same genes
  • interbreed
  • None of the above
Second-generation offspring from a cross are the
  • F$$_1$$ generation
  • F$$_2$$ generation
  • Hybrid generation
  • None of the above
The percentage of ab gamete produced by AaBb parent will be
  • 25%
  • 50%
  • 75%
  • 12.5%
The creation of variations in a species promote _______________.
  • Extinction of species
  • Survival of species
  • No effect on the species
  • None of the above
In 1952, when still a graduate student, he circulated water, ammonia, methane and hydrogen, pass an electric discharge to simulate lightning and got complicated molecules associated with life such as amino acids. This experiment was one of the first great experiments which proved that life indeed could arise from non-living matter. 
Who was this scientist?
  • Donald Arthur Glaser
  • Murray Gell-Mann
  • Carl Sagan
  • Stanley Lloyd Miller
In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that
  • The alleles of two genes are interacting with each other
  • It is a multigenic inheritance
  • It is similar to monohybrid cross
  • The alleles of two genes are segregating independently.
Identify the odd one out from the following :
  • The nails of human beings and claw of a cat
  • Ginger and sweet potato
  • Wings of bat and insect 
  • The trunk of an elephant and hand of a chimpanzee
Mendel's experiments on dihybrid cross was based on
  • Yellow cotyledon, round seed x green cotyledon, wrinkled seed
  • Tall plant, red flower x dwarf plant, white flower
  • Green cotyledon, round seed x yellow cotyledon, wrinkled seed
  • Tall plant yellow flower x dwarf plant, white flower
Mendel's Law of independent assortment stated that: 
  • The segregation of alleles for one gene occurs independently to that of any other gene.
  • When gametes form, alleles are separated so that each gamete carries only one allele for each gene.
  • Recessive alleles will be masked by dominant alleles.
  • The segregation of alleles for one gene occurs dependently to that of any other gene.
If a heterozygous tall pea plant is self-pollinated, what will be the heterozygous:homozygous ratio of the progenies?
  • 1:3
  • 1:1
  • 3:1
  • 1:2
How many genotypes are possible from a cross between the parent $$RR$$ and $$rr$$?
  • Four
  • One
  • Three
  • Two
A brown-eyed couple has a blue-eyed child. The trait of brown eye (B) is dominant over that of blue-eyed (b). What is the genotype of the couple?
  • Bb $$\times$$ Bb
  • BB $$\times$$ BB
  • BB $$\times$$ Bb
  • BB $$\times$$ bb
Which of the following statements (A - E) are wrong:
A. Mendel is called the 'Father of Genetics.'
B. The simplest cross conducted by Mendel is the dihybrid cross.
C. The dominant trait for the visible character seed colour selected by Mendel is green.
D. The first generation offspring is also represented as pure breeding.
E. Mendel's experiments are based on the cross-breeding of two plants of pea differing from each other.
  • B and D only
  • C, D and E
  • B and E only
  • B, C and D
If different alleles are present in the same genotype, then it is called ______________.
  • Homozygous
  • Hetreozygous
  • Dominant
  • Dihybrid
In humans, sex is determined by :
I. 22 pairs of chromosomes which are exactly alike in male and female 
II. A pair of sex chromosomes 
III. Egg with single set of chromosome 
IV. Genetic make up of a sperm
  • III & IV
  • II, III and IV
  • I, III and IV
  • II & IV
Write true or false for the following statement:
An individual can pass on to its progeny the experiences of its lifetime.
  • True
  • False
A pea plant with yellow and round seeds is crossed with another pea plant with green and wrinkled seeds that produced 49 yellow round and 49 yellow wrinkled seeded pea plants. The genotype of parent plant with yellow round seeds must be:
  • YYRr
  • Yyrr
  • YyRR
  • yyRr
Which one is a possible progeny in $$F_2$$ generation of pure bred tall plant with round seed and short plant with wrinkled seeds?
  • Tall plant with round seeds
  • Tall plant with wrinkled seeds
  • Short plant with round seed
  • All of the above
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