In Drosophila, Dichaete (D) is a mutation on chromosome III with ...

Question

In Drosophila, Dichaete (D) is a mutation on chromosome III with a dominant effect on wing shape. It is lethal when homozygous. The genes ebony body (e) and pink eye (p) are recessive mutations on chromosome III. Flies from a Dichaete stock were crossed to homozygous ebony, pink flies, and the F₁ progeny, with a Dichaete phenotype, were backcrossed to the ebony, pink homozygotes. Using the results of this backcross shown in the table,

Phenotype Number
Dichaete 401
ebony, pink 389
Dichaete, ebony 84
pink 96
Dichaete, pink 2
ebony 3
Dichaete, ebony, pink 12
wild type 13

What is the sequence and interlocus distance between these three genes?

Accepted Answer

Hello everyone here We have a question that says if the distance between the non olympic jeans is 24 map units after the F. One individual was test crossed from the parent cross capital S capital S lowercase Y. Lower case Y. Lower case S. Lower case S. Capital Y, capital Y. The percentage of lowercase s. Lowercase S capital Y. Lower case Y. And the F. Two generation is as follow. So we have 100% offspring. And we want to subtract the 24 map units because that is how many components we have so -24 And that equals 76%. Which is our parental recombination. So we have to recombination. It's which is capital S lowercase S. Lowercase Y. Lower case Y. And lowercase S. Lowercase S. Capital Y. Lower case Y. And we're looking for lowercase s. Lowercase S capital Y. Lower case Y. So because we have 24% each one will have half of that. So we'll have 12 and 12%. So our answer is a 12%. Thank you for watching. Bye.

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