Question

this passage describes the huntingtons disease trait in humans: huntingtons disease is a condition that causes the death of brain cells over time. this loss of cells interferes with brain function and may lead to uncontrolled movements, difficulty thinking, and changes in behavior. in a group of humans, some individuals have huntingtons disease and others do not. in this group, the gene for the huntingtons disease trait has two alleles. the allele h is for having huntingtons disease, and the allele h is for not having huntingtons disease. khalil, a human from this group, has huntingtons disease. khalil has one allele for having huntingtons disease and one allele for not having huntingtons disease. based on this information, click the blue words to correct any errors in the text. khalils genotype for the huntingtons disease gene is hh. khalil is homozygous for the huntingtons disease gene. khalil does not have huntingtons disease. this is khalils genotype for the huntingtons disease trait.

Explanation:

1. Since Khalil has one allele for having Huntington's disease ($H$) and one for not having it ($h$), his genotype is $Hh$, which is correct.
2. A homozygous individual has two identical alleles. Since Khalil has $H$ and $h$, he is heterozygous, not homozygous. So "homozygous" should be corrected to "heterozygous".
3. The text clearly states that Khalil has Huntington's disease, so "does not have" should be corrected to "has".

Answer:

• "homozygous" should be "heterozygous"
• "does not have" should be "has"