Principles of Inheritance and Variation Easy Questions and Answers | Page - 15

Principles of Inheritance and Variation

Match the terms in Column-I with their description in Column-II and choose the correct option:

Column-I	Column-II
A.Dominance	1.Many genes govern a single character
B.Codominance	2. In a heterozygous organism only one allele expresses itself
C.Pleiotropy	3. In a heterozygous organism both alleles express themselves fully
D. Polygenic	4.A single gene inheritance influences many characters

1. (ii) (i) (iv) (iii)
1. (ii) (iii) (iv) (i)
1. (iv) (i) (ii) (iii)
1. (iv) (iii) (i) (ii)

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NA

Correct Option: B

NA

In a testcross involving F₁ dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates

1. the two genes are located on two different chromosomes.
1. chromosomes failed to separate during meiosis.
1. the two genes are linked and present on the same chromosome.
1. both of the characters are controlled by more than one gene.

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When two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combinations are much higher than the non-parental or recombinant type. This is also called incomplete linkage.

Correct Option: C

When two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combinations are much higher than the non-parental or recombinant type. This is also called incomplete linkage.

Alleles are

1. true breeding homozygotes
1. different molecular forms of a gene
1. heterozygotes
1. different phenotype

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Alleles are defined as alternative form of same gene.

Correct Option: B

Alleles are defined as alternative form of same gene.

A man with blood group ‘A’ marries a woman with blood group ‘B’. What are all the possible blood groups of their offsprings?

1. A,B and AB only
1. A,B,AB and O
1. O only
1. A and B only

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The possibility of resultant blood group may be A, B, AB and O.

Correct Option: B

The possibility of resultant blood group may be A, B, AB and O.

In his classic experiments on Pea plants, Mendel did not use

1. Pod length
1. Seed shape
1. Flower position
1. Seed colour

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Mendel did not use pod length for his experiment.

Correct Option: A

Mendel did not use pod length for his experiment.