A vision disease called Best disease is caused by a dominant allele. A person with the genotype Bb is

• homozygous dominant.

• affected by Best disease.

• a carrier.

• unaffected by Best disease.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The trait for albinism is recessive. The genotype and phenotype of a person that is heterozygous is

• Aa and affected.

• aa and affected.

• Aa and unaffected.

• AA and unaffected.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Put the following in order of biggest to smallest:

1) allele

2) trait

3) gene

4) chromosome

(">" means "bigger than")

• gene > chromosome > allele > trait

• chromosome > allele > gene > trait

• trait > allele > gene > chromosome

• chromosome > gene and trait > allele

Albinism is a recessive trait where the body does not produce much melanin, the pigment that gives color to the eyes and skin. Neither of the parents have the trait but one of their child does. How is this possible?

• The parents are both aa but it doesn't always appear.

• The parents are carriers Aa which allows each of them to pass down one a allele.

• The trait is not really recessive.

• One parent must be AA and the other parent is aa.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

B and b are two forms of a trait. Each version is called

• a gene

• a trait

• a chromosome

• an allele

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If the trait for tongue rolling is represented by the letters T or t (T - tongue roller, t - non tongue-roller), what is the phenotype of someone who is Tt?

• tongue-roller

• non-tongue roller

• homozygous

• heterozygous

• recessive

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Alleles

• are found on the same place on a chromosome.

• are different versions of a gene for a trait.

• are the dominant forms of gene.

• are genes on a chromosome.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following is a homozygous recessive?

• RR

• Rr

• rr

• rR

Tags

NGSS.HS-LS4-3

Assume the following to be true: The trait for hair length (long or short) is found on chromosome 38. There are two versions for the hair length gene. H is the allele for long hair. h is the allele for short hair. Which of the following represents the PHENOTYPE of Hh?

• long hair

• short hair

• heterozygous

• homozygous dominant

Tags

NGSS.HS-LS3-1

The gene for eye color is represented by the alleles B and b. B is the allele for the brown eye color trait. b is the allele for the blue eye color trait. Which of the following statements is (are) true?

*There may be more than one right answer.

• BB is heterozygous recessive.

• Bb results in the brown eye color phenotype.

• Brown eyes result from the Bb genotype.

• For a child to be bb, both parents have to be bb.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2