All of the offspring produced in a test cross involving a brown rabbit and a white rabbit are brown. The result of this cross is best explained by

• incomplete dominance.

• codominance.

• crossing over.

• Simple dominance.

Tags

NGSS.HS-LS3-1

In certain rats, black fur is dominant over white fur. If two rats, both heterozygous for fur color, are mated, their offspring would be expected to have:

• Three different genotypes and three different colors.

• Three different genotypes and two different colors.

• Two different genotypes and three different colors.

• Four different genotypes and two different colors.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Sickle cell anemia results from a gene mutation that causes abnormalities in red blood cells. The sickle-cell gene is more common in tropical areas, and the individual who is heterozygous for the gene has increased resistance to malaria. If two individuals heterozygous for the sickle-cell gene have offspring, what percent of their offspring are expected to be heterozygous?

• 100%

• 75%

• 50%

• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

A gardener crossed a plant with red flowers with a plant that had white flowers. The offspring plants had pink flowers. What is the most likely genetic reason for these differences in color?

• codominance

• recessive pink genes

• polygenic inheritance

• incomplete dominance

A human baby boy inherits a recessive allele from his mother. In which circumstance would he most likely show the trait coded for by the recessive allele?

• The baby inherits the dominant allele from his father.

• The allele is on the X chromosome.

• The allele is on the Y chromosome.

Tags

NGSS.HS-LS3-1

What percentage of the offspring is homozygous recessive?

• 0%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Round (R) seeds are dominant to wrinkled (r) seeds.
What is the genotype for a homozygous dominant offspring?

• RR
• Rr
• rr

Tags

NGSS.HS-LS3-1

What pattern of inheritance are skin color and height examples of? Note that the individual's phenotype exists somewhere along a spectrum.

• polygenic traits

• multiple alleles

• linked genes

• incomplete dominance

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

What is the name given to all the genetic information that an organism possesses?

• Genome

• Book of Information

• Genus

• Geneticology

Tags

NGSS.HS-LS1-1

What is incomplete dominance?

• Neither allele is completely dominant over the other.

• One allele is not completely dominant over the other.

• Both alleles are recessive.

• Both alleles are dominant.