Human Genetics

___ is when a dominant allele is not completely expressed hence a third phenotype is expressed when an organism is heterozygous.

___ states that each allele is independent from all other alleles, no alleles will influence the segregation of another allele during meiosis.

Tags

NGSS.HS-LS3-2

___ is when one gene determines how another gene is expressed.

• epistasis

• incomplete dominance

• polygenic

• X-linked

___ trait that is controlled by several genes.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Based on what you see on this Punnett square, the trait is an example of

• dominant or recessive

• codominance

• incomplete dominance

• X-linked

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

In human blood, the H gene controls the expression of antigens A and B. The presence of homozygous recessive (hh) makes the the blood type O regardless of the other alleles. This is an example of

• incomplete dominance

• polygenic

• epistasis

• X-linked

___ is used to determine the unknown genotype of the parent by crossing it with an individual with recessive trait.

The presence of freckles in humans is dominant over no freckles. Which of the following statements best describes the chance of a couple with freckles to have children without freckles.

• 25% if both are heterozygous.

• 0% if both are homozygous

• 0% if one of them is homozygous for the trait and the other is heterozygous.

• All are possible answers

Tags

NGSS.HS-LS3-3

John is color-blind (XcY) and his dad is color-blind (XcY). What is the possible genotype of his mother who has normal vision?

Tags

NGSS.HS-LS3-1

Which of the following is not a phenotype?

• Brown eyes

• blood type AB

• BO

• weight = 100 pounds