Question

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

Answer 1

Explanation:

a dihybrid cross gives progency in the ratio 9:3:3:1

Answer 2

It is an example of dihybrid cross.

Option: (a)

Explanation:  

• A dihybrid cross is one in which two characters each having two sets of alleles are considered. Hence there are 4 possibility of the gametes in each of the parents.  

• Hence the total types of offsprings are 16. In this way, 9 of the offsprings have both dominant characters, 3 each has one recessive character and only one of the offspring has both recessive characters.

• This is done with respect to the Mandel's law of the inheritance of the traits.

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