Problem 1- Autosomal Dominant: Widow’s peak (hairline) Having widow’s peak is a dominant trait (use W and w to represent alleles) A man who has a widow’s peak has a child with a woman that does not have widow’s peak. Their child does not have widow’s peak. What is the genotype of the father? _______________ B.) A man with widow’s peak (WW) has a child with a woman who does not have a widow’s peak. What is the probability their child will have a widow’s peak? ____________ Fill out this Punnett square: C.) If both parents are heterozygous for widow’s peak (Ww)…
Background Reminders:
- Dominant allele will express itself in the
phenotype even when in combination with a different allele (recessive).- Example: PP and Pp (purple flowers)
- Recessive allele does not express itself in the phenotype when combined with another allele (dominant)
- Example: pp (white flower) -> expressed only when recessive is by itself
Problem 1- Autosomal Dominant: Widow’s peak (hairline)
- Having widow’s peak is a dominant trait (use W and w to represent alleles)
- A man who has a widow’s peak has a child with a woman that does not have widow’s peak. Their child does not have widow’s peak.
What is the genotype of the father? _______________
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B.) A man with widow’s peak (WW) has a child with a woman who does not have a widow’s peak.
What is the probability their child will have a widow’s peak? ____________
Fill out this Punnett square: |
C.) If both parents are heterozygous for widow’s peak (Ww)…
What is the probability their child will have a widow’s peak? _______________
Fill out this Punnett square: |
- If both parents do not have widow’s peak, what is the probability their child will have a widow’s peak?________________
Problem 2- Autosomal Recessive: Attached Earlobe
- Having an attached earlobe is a recessive trait (use E and e to represent the alleles).
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A.) A woman with an attached earlobe has a child with a man who has an unattached earlobe (heterozygous – Ee). What is the probability their child will have an attached earlobe? ____________ Fill out the Punnett square below to answer this. |
B.) If both parents are heterozygous for unattached earlobe (Ee)… What is the probability their child will have an attached earlobe? _______________ Fill out the Punnett square below to answer this. |
C.) If both parents have attached earlobes, what is the probability their child will have attached earlobe?________________
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