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:

Since Khalil has one allele for having Huntington's disease ($H$) and one for not having it ($h$), his genotype is $Hh$. A homozygous individual would have either $HH$ or $hh$. Since he has the $H$ allele, he has Huntington's disease. So the statements "Khalil is homozygous for the Huntington's disease gene" and "Khalil does not have Huntington's disease. This is Khalil's genotype for the Huntington's disease trait" are incorrect.

Answer:

• Click "homozygous" to correct the statement "Khalil is homozygous for the Huntington's disease gene."
• Click "does not have" to correct the statement "Khalil does not have Huntington's disease. This is Khalil's genotype for the Huntington's disease trait."