Which of the following shows a homozygous recessive genotype?

Which of the following shows a heterozygous genotype?

Which of the following shows a homozygous dominant genotype?

Which of the following shows a homozygous recessive genotype?

Which of the following shows a heterozygous genotype?

Which of the following describes the physical expression of a gene?

Tall plants are dominant to short plants. If a homozygous tall plant and a homozygous short plant cross, what will their offspring look like?

Tall plants are dominant to short plants. If a two heterozygous tall plants are crossed, what is the expected ratio of the offspring?

In pea plants, round seeds are dominant to wrinkled seeds. If a plant with round seeds has a parent with wrinkled seeds, then what is the likely genotype of the plant with round seeds?

Tall plants are dominant to short plants. If a two heterozygous tall plants are crossed, what percentage of the offspring will be heterozygous like the parent plants?

Sickle cell anemia is a codominant trait. If two parents are tested for the sickle cell genotype and find out they each are heterozygous, what is the probability of their offspring having only sickled cells?

In some cattle the genes for brown hair and for white hair are codominant. Cattle with alleles for both brown and white hair, have both brown and white hairs. This condition gives the cattle a reddish color, and is referred to as Roan. What is the probability of a white cow and a brown bull having an offspring with the heterozygous genotype?

The alleles for A(I^A) blood and B(I^B) blood are dominant over the allele for O(i) blood. What is the probability of a mother who has AB blood and a father who is heterozygous for B blood having a child with Type O blood?

The alleles for A(I^A) blood and B(I^B) blood are dominant over the allele for O(i) blood. What is the probability of a mother who has AB blood and a father who is heterozygous for B blood having a child with Type B blood?

In snapdragon flowers the color of the flower is determined by a incompletely dominant gene for red. If you cross a red flower with a white flower, then you get pink. What is probability of a red flower and white flower having red flowered offspring?

In snapdragon flowers the color of the flower is determined by a incompletely dominant gene for red. If you cross a red flower with a white flower, then you get pink. What is probability of a red flower and pink flower having red flowered offspring?

What sex is a human with the genotype XY?

What sex is a human with the genotype XX?

Colorblindness is a sex-linked condition found only on the X chromosome. Which of the following genotypes shows a carrier female?

Colorblindness is a sex-linked condition found only on the X chromosome. What is the chance of a colorblind male (XⁿY) and a carrier female (X^NXⁿ) having colorblind son?

Hemophilia is a sex linked recessive trait. What is the probability, expressed as percentage, of a couple having a female offspring with hemophilia if the male parent does not have hemophilia and the female parent is a carrier?

Hemophilia is a sex linked recessive trait if a couple knows that their daughter has a 100% chance of having hemophilia what are the genotypes of the parents? (Hint: fill in the punnett square first to figure out the parents)

The pedigree is showing the frequency of color-blindness in a family. Color-blindness is a sex-linked recessive trait. What genotype would Ben have?

The pedigree is showing the frequency of color-blindness in a family. Color-blindness is a sex-linked recessive trait. What genotype would his spouse, Amy, have?