Description 2

Dr. Foster: “I’m afraid that answer isn’t correct. As you might recall from the slides Professor York showed in class, a heterozygote carries two different alleles (Aa), while a homozygote has two identical alleles (AA or aa). Let’s step back and think carefully: does the description you chose accurately reflect which combination of alleles is the same or different?

If it doesn’t, it’s time to revisit the lecture materials and the notes you took in the lab. Once you sort that out, take another look at your answer choices and see which one clearly states the difference between homozygous and heterozygous genotypes.”

You remember this lecture slide that Professor York showed in class to refresh your memory.

Resource images adapted from freepik

Pick another answer!

Description 1: Homozygote for the gene is when the two alleles in an individual are the same (AA or aa).Heterozygote for the gene is when the two alleles are different (Aa). 

Description 3: Heterozygote for the gene is when the two alleles in an individual are the same (AA or aa). Homozygote for the gene is when the two alleles can be the same or different (Aa, AA, or aa).