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A fruit fly heterozygous for sex-linked ...

A fruit fly heterozygous for sex-linked genes, is mated with normal female fruit fly. Male specific chromosome will enter egg cell in the proportion

A

`1 : 1`

B

`2 : 1`

C

`3 : 1`

D

`7 : 1`

Text Solution

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The correct Answer is:
To solve the question regarding the proportion of male-specific chromosomes entering the egg cell when a heterozygous male fruit fly is mated with a normal female fruit fly, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Genetic Makeup**: - A heterozygous male fruit fly for sex-linked genes has one normal X chromosome (X) and one mutated X chromosome (X^m), along with a Y chromosome (Y). Thus, his genotype can be represented as X^m X / Y. - The normal female fruit fly has two normal X chromosomes, represented as X / X. 2. **Determine Gametes from Each Parent**: - The male fruit fly can produce two types of gametes: - X^m (from the mutated X chromosome) - Y (from the Y chromosome) - The normal female can only produce one type of gamete: - X (from either of her two normal X chromosomes) 3. **Cross the Gametes**: - When these gametes combine during fertilization, the possible combinations are: - X^m (from male) + X (from female) = X^m X (female offspring with the mutated X) - Y (from male) + X (from female) = Y X (male offspring with normal X) 4. **Analyze the Proportions**: - The offspring will be: - 1 female with the genotype X^m X - 1 male with the genotype Y X - Thus, for every male offspring, there is one female offspring, leading to a 1:1 ratio. 5. **Conclusion**: - Therefore, the proportion of male-specific chromosomes (Y chromosome) entering the egg cell is 1:1. ### Final Answer: The correct option is **1:1**. ---
To solve the question regarding the proportion of male-specific chromosomes entering the egg cell when a heterozygous male fruit fly is mated with a normal female fruit fly, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Genetic Makeup**: - A heterozygous male fruit fly for sex-linked genes has one normal X chromosome (X) and one mutated X chromosome (X^m), along with a Y chromosome (Y). Thus, his genotype can be represented as X^m X / Y. - The normal female fruit fly has two normal X chromosomes, represented as X / X. ...
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