Mrs. Holmer reviews key genetics topics, including basic vocabulary, dihybrid crosses, incomplete and codominant traits, blood typing, sex-linked traits, and pedigrees. She explains how genotypes and phenotypes relate, the use of Punnett squares for dihybrid crosses, and the differences between incomplete dominance and codominance. Blood typing is discussed as an example of multiple alleles and codominance. The video also covers sex-linked traits, focusing on X-linked inheritance, and concludes with an explanation of pedigrees and how to determine genotypes from them.

What is the term for having two identical alleles for a trait?

• Genotype

• Homozygous

• Phenotype

• Heterozygous

If a heterozygous frog is brown, what can be inferred about the brown color?

• It is a recessive trait

• It is a codominant trait

• It is a dominant trait

• It is an incomplete dominant trait

In a dihybrid cross, how many gametes are produced using the FOIL method?

• 2

• 4

• 6

• 8

What does a dihybrid cross help determine?

• The blood type of an individual

• The genetic outcome of two traits

• The phenotype of a single trait

• The genotype of a single trait

What is the result of incomplete dominance between a red and white flower?

• White flowers

• Striped flowers

• Red flowers

• Pink flowers

In codominance, what would be the phenotype of an organism with one blue and one yellow allele?

• Green

• Blue

• Yellow

• Blue with yellow

Which blood type is an example of codominance?

• Type AB

• Type B

• Type A

• Type O

What alleles does a person with type O blood have?

• ii

• IAIB

• IBIB

• IAIA

From whom does a male inherit his X chromosome?

• His mother

• Both parents

• His father

• Neither parent

In a pedigree, what does a shaded square represent?

• A male with the trait

• A female with the trait

• A male without the trait

• A female without the trait