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Introduction to Genetics

A cross where...

Question

A cross where two pairs of alleles are considered is a
(a) dihybrid cross
(b) monohybrid cross
(c) polyhybrid cross
(d) test cross

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Solution

(a) dihybrid cross

A cross in which two pairs of alleles are considered is a dihybrid cross.

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Q. A cross between two individuals results in a ratio of 9 : 3 : 3 : 1 for four possible phenotypes of progeny. This is an example of a :
(a) dihybrid cross
(b) monohybrid cross
(c) test cross
(d) none of these

Select the correct pairs from the given options

A. Dihybrid cross – Independent assortment of characters

B. Back cross – $F_{1}$ hybrid crossed only to homozygous recessive parent

C. Monohybrid cross – Dominance-recessiveness

D. Test cross – Identifying the genotype of hybrid progeny

Q. In the F₂ generation of a cross, progeny having different traits are produced in the ratio 3:1. State whether it is a monohybrid cross or a dihybrid cross. Give one example of such a cross.

Q. Select the option that correctly identifies the number of correct statements.

I. Reciprocal cross is always a type of monohybrid cross
II. Test cross is always type of monohybrid cross
III. Back cross is always a type of monohybrid cross
IV. Back cross is a type of test cross
V. Test cross is a type of back cross

Q. In a dihybrid cross, when one pair of alleles show incomplete dominance, genotypic ratios are

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