Question

question 26
crossing over occurs between___.
a maternal chromosomes.
b sister chromatids.
c nonsister chromatids.
d paternal chromosomes.
e homologous chromosomes.
question 27
you have cystic fibrosis (cf) if you have inherited _.
a two normal cf alleles.
b two normal and two defective cf alleles.
c two normal and one defective cf alleles.
d one normal and one defective cf allele.
e two defective cf alleles.
question 28
2.5 points

Explanation:

• For Question 26: Crossing - over occurs during meiosis and involves the exchange of genetic material between nonsister chromatids of homologous chromosomes.
• For Question 27: Cystic fibrosis is an autosomal recessive disorder. An individual must inherit two defective alleles to have the disease.

Answer:

Question 26: C. nonsister chromatids
Question 27: E. two defective CF alleles