Genetics

Which shows a heterozygous genotype?

If brown eyes are dominant to blue eyes, which of the following genotypes would represent blue eyes?

If the color yellow is dominant over green in pea plants, how would you write the genotype for a homozygous yellow plant?

If R is the dominant trait of roundness in pea plants and r is the recessive for wrinkled, what would the phenotypic ratio be if we crossed a heterozygous pea plant with a wrinkled one?

If R is the dominant trait of roundness in pea plants and r is the recessive for wrinkled, what would the genotypic ratio be if we crossed two heterozygous plants?

T is the dominant trait for tall and t is the recessive trait for short. What percentage of the offspring will be short if we crossed a homozygous tall plant with a short plant?

If we crossed a red flower with a white flower and it resulted in a pink flower, what would explain this?

Cattle can be red (RR = all red hairs), white (WW = all white hairs), or roan (RW = red & white hairs together). What is this an example of?

Cattle can be red (RR = all red hairs), white (WW = all white hairs), or roan (RW = red & white hairs together). What would be the genotypic ratio if we crossed a Roan with a red haired cow?

In rabbits, grey hair is dominant to white hair and black eyes are dominant to red eyes. How would write the genotype for a heterozygous grey and red eyed rabbit?

In rabbits, grey hair is dominant to white hair and black eyes are dominant to red eyes. What would be the phenotypic ratio be if you crossed two heterozygous grey and black eyed rabbits?

A man with type AB blood is married to a woman with type O blood. They have two natural children and one adopted child. Jane has type A blood, Bobby has type B blood, and Grace has type O blood. Which child was adopted?

In fruit flies, eye color is a sex linked trait. Red eye color is dominant to white. What is the phenotype for XRXr?

In fruit flies, eye color is a sex linked trait. Red is dominant to white. What would result if we crossed a homozygous red eyed female with a white eyed male?

A woman’s sister has cystic fibrosis, a disease caused by recessive genes. Neither of her parents has the disease. What chance is there that her mother is a carrier (heterozygous) for the trait? Draw a pedigree if needed.