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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answered: 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.

answered: Guest

how do heroes resolve conflicts in beowulf?

question 15 options:

they sue each other in court

they get a mediator

the seek counseling

they get even or take revenge

explanation:

answered: Guest

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In Drosophila, the two genes w and sn are X-linked and 25 map units apart. A female fly of genotype...