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  • The allele I in Drosophila is recessive, sex-linked and lethal when homozygous or hemizygous. If a female of the genotype LI  is crossed with a male, what is the ratio of females: males in the

The allele I in Drosophila is recessive, sex-linked and lethal when homozygous or hemizygous. If a female of the genotype LI  is crossed with a male, what is the ratio of females: males in the progeny? 

Option: 1

3: 1

 


Option: 2

2: 1


Option: 3

1: 1

 


Option: 4

1: 2


Answers (1)

best_answer

 In the given cross, where a female of the genotype LI (heterozygous for the lethal allele) is crossed with a male, the ratio of females to males in the progeny is expected to be 2:1.

Let's break down the possible genotypes of the offspring:

Female offspring:

L (normal allele) from the father and I (lethal allele) from the mother: LI (carrier of the lethal allele)
L (normal allele) from both parents: LL (normal, non-carrier)

Male offspring:

L (normal allele) from the father and no allele from the mother: L (normal, non-carrier)

Hence, the correct answer is option 2. 

Posted by

Nehul

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