Review: Genetics

Genetically identical plants will produce either pink or blue flowers, depending on the type of soil in which they are planted. What is most likely the explanation for the differences in flower color?

• the flower color gene is codominant

• mutations alter the flower color gene

• the flower color gene is sex-linked

• environmental factors affect flower color

Tags

NGSS.HS-LS4-5

Having freckles is dominant over not having freckles. If two individuals heterozygous for freckles have a child, what is the probability the child will have freckles?

• 0%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Identical twin girls are separated at birth and cared for by two different families. After twenty years, the twins have different heights and weights. What is most likely the cause of these differences?

• one twin had a genetic condition that prevented her from growing tall

• the DNA of one twin was different from the DNA of the other twin

• each twin was provided a different diet and physical activities

• the proteins made by one twin were different than the proteins made by the other twin

Tags

NGSS.HS-LS3-2

A test cross is used to determine the genotype of an unknown individual by crossing it with an individual who is?

• heterozygous

• homozygous recessive

• homozygous dominant

• codominant

Which best explains why males cannot be carriers of X-linked traits?

• Males only have one X chromosome

• Males have two copies of the X chromosome

• Males can be heterozygous for a particular trait

• Males do not have an X chromosome

Tags

NGSS.HS-LS3-1

For a trait is codominant for both red and white alleles for flower color, heterozygous offspring will have flowers with both red and white (speckled). What would the offspring look like if the trait showed incomplete dominance?

• pink

• red

• white

• none of the above

Tags

NGSS.HS-LS3-1

If you cross two individuals who are heterozygous for a trait, what percentage of the offspring will also be heterozygous?

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-3

If two parents, one with Type A blood and one with Type B blood, produce a child with type O blood, what must the genotypes of the parents be?

• heterozygous Type A and heterozygous Type B

• homozygous Type A

• homozygous Type B

• heterozygous Type A and homozygous type O

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Some traits like hair color, eye color, and skin color produce a spectrum of phenotypes due to?

• polygenic

• codominance

• incomplete dominance

• sex-linked inheritance

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A family tree showing the inheritance of a particular trait over generations is known as a?

• phylogenetic tree

• karyotype

• pedigree

• Punnett square

Tags

NGSS.HS-LS3-1