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If both parents are heterozygous w/ a dominant trait...?

irina

wrote...

Posts: 919

Rep:

11 years ago

If both parents are heterozygous w/ a dominant trait...?

I both parents are EX. Dd would the percent chance of the child having this dominant trait be 100% ?

Read 434 times

2 Replies

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Replies

smag

wrote...

#1

11 years ago

No, it would be 75%. If both parents pass on the recessive allele, the child will not have the dominant trait.

mireille

wrote...

#2

11 years ago

No, 75%.

P = Dd x Dd

..........D.........d
.....--------------------
D...|..DD......Dd
d...|..Dd.......dd

DD = 25%
Dd = 50%
dd = 25%

DD and Dd individuals have the dominant trait, so that's 50% + 25% = 75% of offspring that are expected to had the dominant trait.

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