Question

The allele for a widow’s peak has complete dominance over the allele for a straight hairline (w). What is the probability of two parents heterozygous for a widow’s peak (Ww) having an offspring with a widow’s peak?
75 percent
50 percent
0 percent
25 percent

Is the correct answer 50 percent?

Answer 1

did you do a punnett square?

Answer 2

I keep trying to but keep getting messed up on it.

Answer 3

fills those in

Answer 4

which genotypes do you get?

Answer 5

I can get it filled in but then get confused because of the wording of the questions. I come up with 50% WW, 25% Ww, and 25% ww

Answer 6

you're incorrect in part, you'd get:
1 WW
2 Ww
1 ww

now, widow's peak is DOMINANT, meaning as long as it has 1 (capital) W, it will show.

how many have at least 1 W ?

Answer 7

3 with a W

Answer 8

so, what is the probability?

Answer 9

Or I guess you would say 75%

Answer 10

yep, thats it.

Answer 11

Ok thank you so much for explaining it, now I understand it.

Answer 12

that's good, no problem !

Answer 13

Thank you , you were kind to explain it. :)

Answer 14

:)