Biology, 25.06.2020 04:01 fgcherubin

In Drosophila, the two genes w and sn are X-linked and 25 map units apart. A female fly of genotype w+ sn+/w sn is crossed to a wild-type male. What proportion of the male progeny will be w+ sn?

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Answer from: mytymikey123

Answer and Explanation:

Available data:

Two genes w and sn are X-linked and 25 map units apart. A female fly of genotype w+ sn+/w sn is crossed to a wild-type male w+ sn+ Y.

Cross:

Parental) w+ sn+/w sn x w+ sn+ / Y

Gametes) w+sn+ (parental)

w+sn (recombinant)

w sn+ (recombinant)

w sn (parental)

Punnet square)

w+sn+ w+sn wsn+ wsn

w+sn+ w+sn+/w+sn+ w+sn+/w+sn w+sn+/wsn+ w+sn+/wsn

Y w+sn+/Y w+sn/Y wsn+/Y wsn/Y

F1) 50% of the progeny will be males.

50% of the progeny will be females.

There are two possible answers, that depends on how we might analyze the situation:

If we consider the whole progeny (males + females), the proportion of male individuals w+sn/Y will be 1/8=0.125=12.5%

This is:

8 100% of male and female individuals

1 X = 12.5% of w+sn/Y individuals

From the 8 genotype possibilities, there is only one possible w+ sn/Y genotype.

But if we consider only the male progeny, the 50% of the total progeny that belongs to males, represents 100% of male individuals. In this case, the proportion of male individuals w+sn/Y will be 1/4=0.25=25%

This is:

4 100% of males

1 X = 25% of w+sn/Y males

From the 4 male genotype possibilities, there is only one possible w+ sn/Y genotype.

Answer from: Quest

videntify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.

Answer from: Quest

Reproduction i think

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