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The gene for ear lobe attachment has two alleles: the one for free lobes is dominant (A) and the one for attached ear lobes is recessive (a). A woman is heterozygous for this trait. What are the possible gametes she can produce?
In humans, the allele for brown eyes (B) is dominant over the allele for blue (b). A couple, one of whom has brown eyes and the other blue, have four children, all with brown eyes. Is this proof that the brown-eyed parent is homozygous dominant? Why?
You discover a new species of animal which bears, superficially, no known relationship to any living animal. All individuals of the species are phenotypically the same, but the species reproduces sexually. How will you be able to determine which sex is which? Can any help with this question. I don't...