Drosophila has a diploid chromosome number of 2n = 8, which includes one pair of

Question

Drosophila has a diploid chromosome number of 2n = 8, which includes one pair of sex chromosomes (XX in females and XY in males) and three pairs of autosomes. Consider a Drosophila male that has a copy of the A1 allele on its X chromosome (the Y chromosome is the homolog) and is heterozygous for alleles and B1 and B2, C1 and C2 and D1 and D2 of genes that are each on a different autosomal pair. For the questions that follow, assume that no crossovers occur between homologous chromosomes. How many genetically different gametes can this male produce? Enter your answer as a number (example: 4).

Explanation / Answer

The male can produce eight genetically different gametes.

Since it is a male, there is no homolog of A1 allele on its Y chromosome.

Therefore, there are 3 different genes, and each has two different alleles. The total number of combinations they can produce is 23 = 8. The gametes are as follows:

AB1C1D1

A B1C1D2

AB1C2D1

AB1C2D2

A B2C1D1

AB2C1D2

AB2C2D1

AB2C2D2

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