Cystic fibrosis (CF) is caused by a recessive allele. A child has CF, even though neither of his parents has CF. What can you conclude about the parents?
A) One is homozygous dominant for the CF gene, and the other is heterozygous.
B) One is homozygous recessive for the CF gene, and the other is heterozygous.
C) They are both homozygous recessive for the CF gene.
D) They are both homozygous dominant for the CF gene.
E) They are both heterozygous for the CF gene.
Correct Answer:
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Q2: Which type of allele, or allelic combination,
Q3: Which of the following did Gregor Mendel
Q4: Q5: Q6: Crossing red flowering snapdragons with white flowering Q8: In humans, "unattached earlobes are dominant over Q9: If an individual exhibits a recessive trait, Q10: Analyze the validity of the two statements Q11: Alleles that are dominant are: Q12: In the individual with genotype AaBB, what
A) more common
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