Day 4a STAAR Review: Mendelian Genetics

Mendelian Genetics

Genotype - the combination of alleles.

Phenotype - the physical characteristics

​Dominant-this allele masks a recessive allele...it DOMINANTS! AA or Aa
Recessive -this allele is only seen when it is paired with another recessive allele. It MUST BE HOMOZYGOUS to be expressed. aa

Multiple Choice

A cleft chin phenotype is dominant to no cleft. Which of the following genotypes is NOT a cleft chin?

• Cc

• CC

• cc

Multiple Select

Dimples are dominant to no dimples. Choose all of the genotypes that are dimple phenotypes.

• Dd

• dd

• DD

Multiple Choice

Freckles are dominant to no freckles. A genotype that is heterozygous will have which phenotype?

• freckles

• no freckles

Homozygous Dominant (RR)

Heterozygous (Rr)

Homozygous Recessive (rr)

Multiple Choice

Which of the following genotypes is homozygous dominant?

• DD

• Dd

• dd

Multiple Choice

Which of the following genotypes is heterozygous?

• Mm

• MM

• mm

Multiple Choice

The genotype, Pp, is _______.

• homozygous dominant

• heterozygous

• homozygous recessive

Multiple Choice

The genotype, jj, is _______.

• heterozygous

• homozygous dominant

• homozygous recessive

Multiple Choice

The genotype, KK, is

• heterozygous

• homozygous dominant

• homozygous recessive

Multiple Choice

Which of the following genotypes is homozygous recessive?

• Aa

• aa

• AA

Multiple Choice

In guinea pigs, the allele for short hair is dominant. What genotype would a heterozygous short-haired guinea pig have?

• Ss

• SS

• ss

Punnett Squares are used to predict the probability of a cross of two parents.

Each parent has 2 alleles in their genotypes.

Multiple Choice

Green flowers are dominant to yellow flowers. If the parents (GG and gg) are crossed, what percentage of the offspring will have green flowers?

• 100%

• 75%

• 50%

• 25%

• 0%

Multiple Choice

Green flowers are dominant to yellow flowers. If two heterozygous parents are crossed, what percentage of their offspring will be homozygous dominant?

• 100%

• 75%

• 50%

• 25%

• 0%

Multiple Choice

Black fur is dominant to brown fur in dogs. A brown fur dog is crossed with a dog that is heterozygous. What percentage of the offspring will be black?

• 100%

• 75%

• 50%

• 25%

• 0%

Multiple Choice

Black fur is dominant to brown fur in dogs. A brown fur dog is crossed with a dog that is homozygous dominant. What percentage of the offspring will be brown?

• 100%

• 75%

• 50%

• 25%

• 0%

That's all folks.