Please take a look at the attachment. In Drosophila, females expressing 3 X-linked recessive traits, scute bristles(sc), sable body (s), and vermilion eyes (v) are crossed with WT males. Inthe F₁, all females are WT, while all males express all three mutant traits.The cross is carried to the F₂ generation, and 1000 offspring are countedwith the results below:1)c)d)2)+8SC S+ 8+s3) +S VSC + +> ++sSC + VS> ++SC S+4) + + V3142801501564630101459.4%30.6%7.6%2.4%What is the map order for the three genes?a) sc s vb)sc v sv SC SThe order can't be determined

Answered: In Drosophila, females expressing 3…

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Please take a look at the attachment.

In Drosophila, females expressing 3 X-linked recessive traits, scute bristles
(sc), sable body (s), and vermilion eyes (v) are crossed with WT males. In
the F₁, all females are WT, while all males express all three mutant traits.
The cross is carried to the F₂ generation, and 1000 offspring are counted
with the results below:
1)
c)
d)
2)
+8
SC S
+ 8
+s
3) +
S V
SC + +
> +
+s
SC + V
S
> +
+
SC S
+
4) + + V
314
280
150
156
46
30
10
14
59.4%
30.6%
7.6%
2.4%
What is the map order for the three genes?
a) sc s v
b)
sc v s
v SC S
The order can't be determined

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Step 1

Ans:-

Explanation:- First of all we need to find out the genotypes, which are of parental type, which are double cross-overs, and which are with single cross-overs.

Generally, parental type genotypes are those which are more in number, here sc-s-v genotype has 314 individuals and the +-+-+ genotype are 280 individuals so they are parental type genotypes.

Double cross-overs are those events which are less in number sc s + genotype are 10 individuals and + + v genotype are 14 individuals so these genotypes are due to double cross-overs.

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