Consider the following scenario: A man without freckles (freckles are a dominant trait, determined by the dominant allele “F”) is a carrier of cystic fibrosis (recall that CF is a recessive trait, determined by the recessive allele "a"), mates with a woman whose genotype is heterozygous for freckles and is also a carrier of CF. Assume the two genes in question are in different chromosomes and, therefore, assort independently. Complete the following Punnett square to generate the offspring probabilities from this couple, by entering the genotypes of the parents, the gametes, and the offspring for the two traits described above. (4) Father’s genotype ffAa Mother’s genotypeFfAa ● Sperm: fA ● Sperm: fa ● Sperm: fA ● Sperm: fa ● Egg: FA ● Egg: fA ● Egg: Fa ● Egg: fa What is the probability for this couple to have a child with freckles? What is the probability for this couple to have a child with CF? What is the probability for this couple to have a child that is a CF carrier? What is the probability for this couple to have a child that has freckles AND is a CF carrier? What is the probability for this couple to have a child that has both freckles AND CF?
Consider the following scenario: A man without freckles (freckles are a dominant trait, determined by the dominant allele “F”) is a carrier of cystic fibrosis (recall that CF is a recessive trait, determined by the recessive allele "a"), mates with a woman whose genotype is heterozygous for freckles and is also a carrier of CF. Assume the two genes in question are in different chromosomes and, therefore, assort independently.
Complete the following Punnett square to generate the offspring probabilities from this couple, by entering the genotypes of the parents, the gametes, and the offspring for the two traits described above. (4)
Father’s genotype ffAa Mother’s genotypeFfAa
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● Sperm: fA |
● Sperm: fa |
● Sperm: fA |
● Sperm: fa |
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● Egg: FA |
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● Egg: fA |
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● Egg: Fa |
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● Egg: fa |
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What is the probability for this couple to have a child with freckles?
What is the probability for this couple to have a child with CF?
What is the probability for this couple to have a child that is a CF carrier?
What is the probability for this couple to have a child that has freckles AND is a CF carrier?
What is the probability for this couple to have a child that has both freckles AND CF?
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