6.4 - Beyond Mendel

T/F: In codominance, the heterozygous phenotype is an intermediate phenotype between the two homozygous phenotypes.

• true

• false

Answer explanation

This would be incomplete dominance!

In codominance, two alleles are expressed in the phenotype fully and separately.

In chickens, alleles for black & white feathers are codominant. What is the probability of getting a black chick if you cross two erminette (het)?

• 1/4

• 1/2

• 3/4

• 4/4

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

If a woman with Type A blood and a man with Type O blood have a child that is Type O, what is mom's genotype?

• IᴬIᴮ

• IᴬIᴬ

• Iᴬi

• ii

Answer explanation

Dad is type A, so he must have an A allele, but the type O child has to get an O allele from both mom and dad, so dad must be heterozygous.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

T/F: Males can be carriers of X-linked traits

• true

• false

Answer explanation

Males only have one X chromosome, so they will either have the trait or not, they cannot be a carrier.

Polygenic traits are only caused by 1 gene.

• true

• false

Answer explanation

Poly means many. Polygenic traits involve 2+ genes.

If a man with normal vision has a child with a woman who is colorblind, what is the chance they will have a colorblind child?

• 1/4

• 1/2

• 3/4

• 4/4

Answer explanation

Any son would be, no daughter would be. 1/2 of Punnett square shows an affected offspring.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

T/F: The environment plays no role in phenotypes.

• true

• false

Tags

NGSS.HS-LS3-2

What is NOT a possible genotype for someone with type B blood?

• I^BI^B

• I^AI^B

• I^Bi

What is the phenotype of a person with the genotype I^Bi?

• type A

• type O

• type B

• type AB

What pattern of inheritance is shown in this image?

• Codominance

• Incomplete dominance

• Complete dominance

Tags

NGSS.HS-LS3-1