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Principles Of Inheritance And Variation Class 12 MCQs Questions with Answers
Person having genotype IA IB would show the blood group as AB. This is because of
(d) incomplete dominance
Answer: (b) co-dominance
In a dihybrid cross, if you get 9 : 3 : 3 : 1 ratio it denotes that
(a) the alleles of two genes are interacting with each other
(b) it is a multigenic inheritance
(c) it is a case of multiple allelism
(d) the alleles of two genes are segregating independently
Answer: (d) the alleles of two genes are segregating independently
A cross between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents ?
(a) TT and Tt
(b) Tt and Tt
(c) TT and TT
(d) Tt and It
Answer: (b) Tt and Tt
Which of the following will not result in variations among siblings ?
(a) Independent assortment of genes
(b) Crossing over
Answer: (c) Linkage
Occasionally, a single gene may express more than one effect. The phenomenon is called
(a) multiple allelism
Answer: (c) pleiotropy
The colour based contrasting traits in seven contrasting pairs, studied by Mendel in pea plant were
Answer: (c) 3
_________ pairs of contrasting traits were studied by Mendel in pea plant
Answer: (b) 7
Success of Mendal is
(a) Selection of Pea plant
(b) Studied of free characters
(c) More Characters selection
(d) Pea is Bisexual
Answer: (a) Selection of Pea plant
Rh+ individual gene may be
(d) Both (a) and (c)
Answer: (c) Rr
A true hybrid condition is
(a) tt Rr
(b) Tt rr
(c) tt rr
(d) Tt Rr
Answer: (c) tt rr
Test cross involves
(a) crossing between two genotypes with dominant trait
(b) crossing between two genotypes with recessive trait
(c) crossing between two F1 hybrids
(d) crossing the F1 hybrid with a double recessive genotype
Answer: (d) crossing the F1 hybrid with a double recessive genotype
What is the probability of production of dwarf offsprings in a cross betweeen two heterozygous tall pea plants ?
(b) 50 %
(c) 25 %
(d) 100 %
Answer: (c) 25 %
Haplodiploidy is found in
(a) grasshoppers and cockroaches
(b) birds and reptiles
(c) butterflies and moths
(d) honeybees, ants and wasps
Answer: (d) honeybees, ants and wasps
A couple has six daughters. What is the possibility of their having a girl next time ?
(a) 10 %
(b) 50 %
(c) 90 %
(d) 100 %
Answer: (b) 50 %
What will be the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus ?
(a) 3 : 1
(b) 1 : 2 : 1
(c) 1 : 1
(d) None of these
Answer: (c) 1 : 1
It is said that Mendel proposed that the factor controlling any character is discrete and independent. His proposition was based on the
(a) results of F3 generation of a cross.
(b) observations that the offspring of a cross made between the plants having two contrasting
characters shows only one character without any blending.
(c) self pollination of F1 offsprings.
(d) cross pollination of F1 generation with recessive parent.
Answer: (b) observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending.
What will never be father’s blood group if the mother has blood group B and child blood
Answer: (c) AB
Haemophilia is a
(a) Mendalian disorder
(b) Chromosomal disorder
(c) Can be (a) or (b)
(d) None of the above
Answer: (a) Mendalian disorder
Failure of segregation of chomatids during cell division cycle results in the gain or loss of a chromosome(s) is called
(a) Female heterogamety
(b) Male heterogamety
(d) None of the above
Answer: (c) Aneuploidy
Punnett square was developed by
(b) Watson and Sútton
Answer: (c) Reginald
Conditions of a karyotype 2n + 1, 2n – 1 and 2n + 2, 2n – 2 are called
Answer: (a) aneuploidy
In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine?
(a) G G G
(b) A A G
(c) G A A
(d) G U G
Answer: (d) G U G
All genes located on the same chromosome
(a) form different groups depending upon their relative distance
(b) form one linkage group
(c) will not from any linkage groups
(d) form interactive groups that affect the phenotype
Answer: (b) form one linkage group
Inheritance of skin colour in humans is an example on
(a) point mutation
(b) polygenic inheritance
(d) chromosomal aberration
Answer: (b) polygenic inheritance
In Mendel’s experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY × rryy?
(a) Round seeds with yellow cotyledons, and wrinkled seeds with yellow cotyledons.
(b) Only round seeds with green cotyledons.
(c) Only wrinkled seeds with yellow cotyledons.
(d) Only wrinkled seeds with green cotyledons.
Answer: (a) Round seeds with yellow cotyledons, and wrinkled seeds with yellow cotyledons.
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