12 Jun BIOLOGY 100 In humans, red-green colorblindness is a sex-linked recessive
Question
1. In humans, red-green colorblindness is a sex-linked recessive trait. A normal woman has
a colorblind son with a normal man.
1. What is the woman’s genotype?
2. What is the son’s genotype?
3. What is the father’s genotype?
4. What is the mom’s phenotype?
5. What is the dad’s phenotype?
2. Gregor Mendel used pea plants in his genetics experiments. If he crossed a
homozygous green pea pod with a heterozygous green pea pod:
1. What is the probability that a yellow pea pod would result?
2. What is the genotype of a homozygous green pea pod?
3. What is the genotype of a heterozygous green pea pod?
4. What is the dominant allele for pea pod color?
5. What is the recessive allele for pea pod color?
3. Xeroderma pigmentosum is an autosomal recessive disorder. If a normal woman wants
to have children with a man with this disorder:
1. What is/are the genotype(s) of the woman?
2. What is the genotype of the man?
3. What is the genotype of the child if mom is homozygous?
4. What is the phenotype of the child?
5. Is the xeroderma pigmentosum gene on the Y chromosome?
4. In cats, short fur is most prevalent over long fur.
1. Which allele is dominant?
2. Which allele is recessive?
3. What would be the genotype of a homozygous short-fur cat?
4. What would be the genotype of a homozygous long-fur cat?
5. What would be the genotype of a heterozygous dominant cat?
5. Gametes are sex cells. According to Gregor Mendel’s laws:
1. How many total chromosomes are in a normal human sperm cell?
2. How many total chromosomes are in a normal human egg cell?
3. How many total chromosomes are in a Down Syndrome autosomal cell?
4. How many total chromosomes are in a normal human skin cell?
5. What genetic mistake occurred in Down’s Syndrome?
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