If 'A' represents the dominant gene and 'a' represents its recessive allele, which of the following would be the most likely result in the first generation offspring when Aa is crossed with aa ?

All will exhibit dominant phenotype

All will exhibit recessive phenotype

Dominant and recessive phenotypes will be 50% each

Dominant phenotype will be 75%

Solution

Dominant and recessive phenotypes will be 50% each

'A' represents the dominant gene and 'a' represents its recessive allele. The most likely result in the first generation offspring when Aa is crossed with aa is :

Parents : Aa $\times$ aa

Gametes : A, a, a, a

F1 generation : Aa Aa aa aa

Hence, Aa : aa = 1 : 1

Some More Questions From Principles of Inheritance and Variation Chapter

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Principles Of Inheritance And Variation

Some More Questions From Principles of Inheritance and Variation Chapter

Who were the rediscoverers of Mendelism ?

What are the real determinants of what an organism will become ?

What is the unique feature of F1 generation ?

What will be the genetic make up of an organism which suffers from sickle cell anaemia ?

What do the symbols square and circle in a pedigree chart indicate ?

Define heterogamy. Give an example.

How many chromosomes are found in human cells ?

Why is male Drosophila regarded as heterogametic ?

What term is used for the two chromatids resulting from the interchange of segments during crossing over ?

What is name of a cross in which a dominant individual is crossed with a recessive parent?

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