NAME: DATE: PERIOD: Punnett Square REVIEW 5 Steps to Solve Every Punnett Square Problem! Having a Widow’s peak is dominant to not having a widow’s peak. Chris is homozygous and has a widow’s peak. Pam is heterozygous for a widow’s peak. What is the probability that they will have a kid who has a widow’s peak? 1. Dominant or Recessive? 2. What are my three options? 1. 2. 3. 3. What are the parents’ genotypes? Use clues in the question to figure it out! YOU HAVE 3 OPTIONS. 4. Fill in the Punnett Square! 5. Answer the question! What phenotype does the question ask about? TRY IT! Hector owns a spotted dog (d). The allele for spots is recessive to the allele for no spots. If his heterozygous dog mates with a homozygous spotted dog, what are the chances they will make a puppy that is NOT spotted? 1. Dominant or Recessive? 3. What are the parents’ genotypes? Mom – Dad –
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Punnett Square REVIEW
· 5 Steps to Solve Every Punnett Square Problem!
· Having a Widow’s peak is dominant to not having a widow’s peak. Chris is homozygous and has a widow’s peak. Pam is heterozygous for a widow’s peak. What is the probability that they will have a kid who has a widow’s peak?
1. Dominant or Recessive?
2. What are my three options?
1.
2.
3.
3. What are the parents’ genotypes? Use clues in the question to figure it out! YOU HAVE 3 OPTIONS.
4. Fill in the Punnett Square!5. Answer the question! What phenotype does the question ask about?
TRY IT! Hector owns a spotted dog (d). The allele for spots is recessive to the allele for no spots. If his heterozygous dog mates with a homozygous spotted dog, what are the chances they will make a puppy that is NOT spotted?
1. Dominant or Recessive?3. What are the parents’ genotypes?
Mom – Dad –
2. What are my three options? 4.
1.
2.
3.
5. Answer:
1.
2.
3.
4. Two parents with a history of sickle cell disease (a disease that leads to sickle shaped red blood cells that can clog arteries) in their families are concerned about their chances of having a baby with sickle cell disease. Sickle cell disease is a recessive disease (s). The mom and dad are both heterozygous for sickle cell disease. What are the chances (percent) that they will have a kid with sickle cell disease?
NAME:
DATE:
PERIOD:
a.
b. 0%
c. 25%
d. 50%
e. 100%
5.
PEDIGREES REVIEW
Take a look at the pedigree!
1. Are there a lot of people with the disease?
YES dominant
NO recessive
REMEMBER, carriers do NOT have the disease!
2. Is it sex-linked?
· Are there A LOT more males affected (with the disease) than females?
YES SEX-LINKED
NO AUTOSOMAL
1.
2. Using the pedigree to the RIGHT, what mode of inheritance does this genetic disorder follow?
0. Autosomal recessive
0. Sex-linked recessive
0. Autosomal dominant
0. Sex-linked dominant
3.
4.
5.
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