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In Drosophila, crossing over occurs in female but not in a male. Gene A and B are 10 map unit apart on the chromosome. A female Drosophila is with genotype ABab and male Drosophila with genotype ABab. Then how many types of gametes are produced by female and male Drosophila respectively?

A
4 types: 2 types
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B
2 types : 2 types
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C
4 types : 4 types
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D
4 types: one types
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Solution

The correct option is A 4 types: 2 types
The linkage is referred to as the phenomenon wherein alleles located close together on a chromosome show a tendency to be inherited together during meiosis. Genes present near to each other have less probability of being separated onto different chromatids during the chromosomal crossover. Therefore, when a cluster of genes shows linkage behavior they do not show independent assortment.
The total possible type of gametes produced by an organism is 2n where "n" is the number of genes for which the person is heterozygous. Female Drosophila is heterozygous for 2 gene pairs and shows cross over, thus it will form a total of four types of gametes ( 22=4; two parental types and two recombinants). These are AB, ab, Ab, and aB. Since male Drosophila does not show cross over, it will form a total of two parental types of gametes; AB and ab.

So, the correct answer is option A.

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