M = Mutant allele, W = Wild-type allele, we may determine the phenotypes and cou

Question

M = Mutant allele,

W = Wild-type allele,

we may determine the phenotypes and counts of the F1 offspring and F2 offspring produced by an F1-intercross mating (using the Fly Lab software).

What values would you use for the expected counts of the Red-eyed flies and the Purple-eyed flies in a Chi-square goodness of fit test, where the observed data are the F2 phenotype counts (all counts are rounded to nearest integer)?

A.

Male flies with red eyes: 384;
Female flies with red eyes: 384;
Male flies with purple eyes: 128;
Female flies with purple eyes: 128.

B.

Male flies with red eyes: 375;
Female flies with red eyes: 375;
Male flies with purple eyes: 125;
Female flies with purple eyes: 125.

C.

Male flies with red eyes: 250;
Female flies with red eyes: 250;
Male flies with purple eyes: 250;
Female flies with purple eyes: 250.

D. THIS ISNT THE ANSWER

Male flies with red eyes: 128;
Female flies with red eyes: 128;
Male flies with purple eyes: 384;
Female flies with purple eyes: 384.

E.

Male flies with red eyes: 125;
Female flies with red eyes: 125;
Male flies with purple eyes: 375;
Female flies with purple eyes: 375.

1. Parental mating 1. Parental rm GFlyLab Female: PR Male: Click a Design button to design a fly. Click Mate button when you have two flies ready to mate. Mate Each Mating Creates 1000 Offspring Remoue Remoue 2. Offspring (F1) phenotypes and counts Female: +. N=516 Male: +. N=484 2 fly images Cross #2 Offspring

Explanation / Answer

According to the number of progeny in F2 generation, we can say that progenies rely on 1:1:1:1 ratio.

The total number of F2 progeny is – [381 + 362 + 149 + 131] = 1023

So, the expected number of male flies with red eyes: [1023*1/4] = 255.75

The expected number of female flies with red eyes: [1023*1/4] = 255.75

The expected number of male flies with purple eyes: [1023*1/4] = 255.75

The expected number of female flies with purple eyes: [1023*1/4] = 255.75

Thus, the correct option is – (C).

Male flies with red eyes: 250;
Female flies with red eyes: 250;
Male flies with purple eyes: 250;
Female flies with purple eyes: 250.

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