old exam question

[n2o*]

An autosomal dominant trait showing 50 percent penetrance will be phenotypically expressed in what percentage of the offspring?

0
25
33
50
75


please explain why the answer is 25

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[Bugab00]

An autosomal dominant trait showing 50 percent penetrance will be phenotypically expressed in what percentage of the offspring?

0
25
33
50
75


please explain why the answer is 25

I don't think we have the full question here. It is probably rare, meaning 1 parent has 2 homozygous recessive alleles and the other has only 1 dominant allele.

If you do a punnet square with Aa and aa, you get 50% affected, but since there is only 50% penetrance, you cut that number in half

 

[dental degree]

can someone explain this question.

If anticodon on t rna is 5'ACG3', then what will be the codon on coressponding mRNA
5'CGU3'(ans)
5'UGC3'
I think the second one should be the ans.

 

[SuperC]

can someone explain this question.

If anticodon on t rna is 5'ACG3', then what will be the codon on coressponding mRNA
5'CGU3'(ans)
5'UGC3'
I think the second one should be the ans.

The correct answer is 5'-CGU-3' Because the two strands should be anti-parallel. So...

5'-ACG-3'
3'-UGC-5'

-C