1.How many alleles are used to represent a particular trait? 2.Widow’s peak is a dominant trait and is represented with a capital “W”. Straight hairline is a recessive trait and is represented

1.How many alleles are used to represent a particular trait?

2.Widow’s peak is a dominant trait and is represented with a capital “W”. Straight hairline is a recessive trait and is represented by a lowercase “w”. What possible genotypes would an individual with a widow’s peak phenotype have? What genotype would an individual with a straight hairline phenotype have?

3.The gene for earlobe has two alleles; detached (A) and attached (a).

a. What is the probability that one child of a mother with genotype AA and a father with genotype Aa will have the genotype AA? (Use a Punnett Square to figure it out)

b. What is the probability for the various phenotypes and genotypes be for the following genetic cross, Aa x Aa?

4.The gene for pea shape has two alleles: round (R) and wrinkled (r). What is the probability for the various phenotypes and genotypes be for the following genetic crosses? (Use a Punnett Square to figure it out)

a. Homozygous dominant x homozygous recessive

b. Homozygous dominant x heterozygous

c. Heterozygous x heterozygous

d. Two homozygous recessive plants

5.What is the probability that any one child of two parents will be female? (Use a Punnett Square to figure it out)

7.The gene for eye shape has two alleles: star-shaped eyes (E) and blast shaped eyes (e). Grandma and Grandpa Smiley are heterozygous for the star eye shape. If one of their heterozygous children married a girl with blast-shaped eyes, what is the probability of their grandchildren begin star-shaped eyes? What percent would be blast-shaped eyes? (Use a Punnett Square to figure it out)

6.How many sex-linked recessive traits does a female versus a male need in order to have the trait appear in their phenotype?

7.Hemophilia is a sex-linked trait. If a mother is a carrier for hemophilia and the father has hemophilia, what is the probability that their offspring would also be affected (have the phenotype) by hemophilia?

8.Be able to analyze a pedigree chart. Know the difference between the shapes, shades, generations, bars connecting individual together, possible genotypes, and family relationships.