Free ear lobes is the dominant allele with attached ear
lobes being the recessive allele. If the woman is homozygous dominant, meaning both of
her alleles are for free lobes all children will have free lobes because the dominant
allele always wins out.
If the woman is heterozygous for
free lobes meaning she has one allele for free ear lobes and one allele for recessive
ear lobes, half of the children could have free lobes, while half could have attached
ear lobes.
In the second example I used the word could
because each child would have a 50% chance of getting each allele. It could be that all
children would have free or all children could have attached, it just depends on which
allele each child receives.
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