9. In Drosophila , a recessive autosomal gene ebony ( e ) produces black color,
ID: 53504 • Letter: 9
Question
9. In Drosophila, a recessive autosomal gene ebony (e) produces black color, and an independently assorting autosomal recessive gene, black bl, also produces black body color when homozygous.
e/e; bl/bl, and e/e; bl/ bl flies are phenotypically indistinguishable in body color. If true-breeding
e/e; bl+/bl+ flies are crossed with true-breeding e+/e+ bl/bl flies,
a. what will be the phenotype of the F1?
b. what phenotypes and what proportions would occur in the F2 if the F1 from part a were intercrossed?
Explanation / Answer
In Drosophila, ebony (eb) produces dark body when homozygous, and independently assorting gene black (bl) gives same effect: it produces dark body color when homozygous. The phenotypic ratios are expected among progeny of cross between F1 are 1/2 ebony e/e and 1/2 WT e/e+.
In Drosophila, ebony (eb) produces dark body when homozygous, and independently assorting gene black (bl) gives same effect: it produces dark body color when homozygous. Note that WT Drosophila are brown. The phenotypes and proportions of progeny are expected from F2 are 9/16 brown and 7/16 black
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