In which genotype would the recessive allele be expressed.

• AA

• aa

• Aa

• XY

Two heterozygous brown gerbils are crossed. If brown is dominant to white, what are the expected phenotypic results?

• 25% Brown 75% White.

• 50% Brown 50% White

• 100% Brown

• 75% Brown 25% White

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which allele/gene will always be expressed if present?

• Sex Linked Genes

• Dominant alleles

• Recessive alleles

• Mutated Genes

Tags

NGSS.HS-LS4-3

Which Law states that the dominant gene, if present, will be expressed as the phenotype?

• Law of Dominance

• Law of Segregation

• Law of Independent Assortment

• Law of Gravity

In this Punnett Square A represents the dominant gene for almond shaped eyes and a represents the recessive gene for round eyes. A homozygous dominant and a homozygous recessive are crossed. What percent of the offspring will have round eyes.

• 100%

• 75%

• 50%

• 0%

Tags

NGSS.HS-LS3-1

If man with almond eyes is crossed with a woman with round eyes (remember almond eyes are dominant). They have 10 children, 5 have almond eyes and 5 have round eyes. What must be the genotypes of the parents to create this phenotypic ratio?

• AAXaa

• AaXaa

• AAXAa

• AaXAa

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If two heterozygous parents are crossed what would the genotypic ratio of the offspring be?

• 100% Bb

• 50%BB 50%Bb

• 25%BB 50%Bb 25% bb

• 50% Bb 50% bb

Tags

NGSS.HS-LS3-1

Which genotypes are homozygous?

• AA

• bb

• Tt

• ss

Which genotypes are heterozygous

• BB

• AA

• Ee

• tt

For a female to have a recessive sex-linked trait like hemophilia she must have what?

• Two dominant alleles

• Two recessive alleles

• One recessive allele

• a Y chromosome