In humans, the allele for having dimples is dominant to the allele for not having dimples. What would you expect to see in the offspring of a woman with dimples who is homozygous and a man who is heterozygous for the trait?
All of their offspring will have dimples.
None of their offspring will have dimples.
The probability of their offspring having dimples is 50%.
Their offspring will have a 75% chance of having dimples.
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The mother is homozygous dominant for dimples - it means that both her chromosomes with this gene on them have the dominant allele. Whichever she passes on to her offspring will have the dominant gene; therefore all the offspring will express the dominant allele.