Staar Genetics

What is the probability of having heterozygous offspring?

• 25%

• 50%

• 0%

• 100%

Tags

NGSS.HS-LS3-3

Which of the following is homozygous dominant?

• Mm

• MM

• mm

In domesticated dogs, hair type is controlled by two different alleles. The allele for wire hair is (H) and the allele for smooth hair is (h). When two heterozygous dogs are crossed, what percentage of the offspring is expected to be homozygous for smooth hair?

• 0%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Chickens can have different types of feathers. Frizzled feathers curl toward a chicken’s head. The allele for frizzled feathers is dominant over the allele for straight feathers. In a cross between two chickens with straight feathers, what percentage of the offspring can be expected to have frizzled feathers?

• 0%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

What is the probability of cloven hooves in the offspring of parents that are heterozygous for the trait?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS4-3

In humans blood type is determined by the A, B, and O alleles. The A and B alleles are codominant to each other and dominant over the O allele. An individual with the AO genotype and an individual with the BO genotype can produce offspring with which of the following phenotypes?

• O only

• A or B only

• A, B, or O only

• A, B, AB, or O

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following is homozygous recessive?

• Tt

• tt

• TT

DNA is considered a universal genetic code. Which statements are true of the genetic code? Pick THREE correct sentences.

• The order of nucleotide sequences of the genetic code is the same for all living organisms.

• The components that make up the genetic code are common among all living organisms.

• Proteins are assembled from a four letter codon that specifies what amino acids are needed.

• The genetic code uses the four nucleotide bases: adenine, guanine, cytosine, and thymine.

• Amino acid sequences on the genetic code can be determined by the arrangement of the codons.

Tags

NGSS.HS-LS1-1

A sequence of DNA undergoes the following change:

TAC ACA CAA ACG GGG → TAC ACA GGA ACG GGG

This mutation will cause the amino acid​ (a)   to be replaced by .​ ​ (b)  

• Valine

• Proline

• Cysteine

• Threonine

• Glutamine

• Glycine

Tags

NGSS.HS-LS1-1

NGSS.HS-LS1-6

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following genotypes represents a homozygous recessive trait?

• AA

• Aa

• aa

• aA