Eye color in the fruit fly Drosophila is controlled by a locus with a multiple a

Question

Eye color in the fruit fly Drosophila is controlled by a locus with a multiple allelic series. A fly population which exists in the wild is known to possess six different alleles for the eye- color gene. a. What is the minimum number of allelic types for this trait that could be carried by a single individual? b. What is the maximum number of allelic types for this trait that could be carried by a single individual? c. What is the number of different genotypes that could arise from these six alleles? d. How many of these different genotypes would be homozygous? e. How many of these different genotypes would be heterozygous?

Explanation / Answer

Eye color trait shows multiple allelism and if contain six kind of alleles in population. then

a. in a population some of the fly bears same alleles i.e it is homozygous condition. so minimum one type allele can present in fly.

b. since their is only two position for color eye allele in an individual so maximum two type of alleles can present i.e. heterozygous condition.

c. in a population six kinds of alleles are present while each individual has only two position for these alleles so possible combination is 6x 6 = 36 i.e. only 36 kind of different comination of these alleles can be present in population.

d. since there are six kinds of alleles and which can appear in homozygous state so maximum six kind of homozygous fly can present.

e. out of homozygous from total possible combination will be heterozygous. so 36- 6 = 30 type of hereozygous combination can present in polulation.

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