Heredity Test Review 2020

Which best explains why an organism with "Aa" will NOT show the recessive phenotype?

• one allele is dominant

• there are multiple possible alleles

• both alleles are dominant

• There are many other genes influencing this phenotype

In rabbits, spots (R) are dominant to solid color (r). What are the genotypes of the spotted baby rabbits?

• RR

• Rr

• rr

• Cannot be determined

In rabbits, spots (R) are dominant to solid color (r). What are the genotypes of the parents?

• rr x rr

• Rr x rr

• Rr x Rr

• RR x rr

If an organism inherits one dominant allele and one recessive allele for a trait, their genotype is called

• Haploid

• Homozygous

• Heterozygous

• Homologous

In guinea pigs, rough coat (R) is dominant to soft (r). If two parents mate and produce offspring that are 50% rough and 50% smooth, what must the parent genotypes be?

• RR x rr

• Rr x rr

• RR x Rr

• Rr x Rr

B is dominant for blue feathers, and b is recessive for red feathers. Describe the two parents.

• Both are blue

• Both are red

• One is red, the other is blue

• Both are purple

B is dominant for blue feathers, and b is recessive for red feathers. What % of the offspring will have red feathers?

• 0%

• 100%

• 25%

• 50%

Imagine two parents, one heterozygous for Marfan disease, and the other homozygous recessive and healthy. What would the genotypic ratio of their offspring be?

• 100% Mm

• 50% MM, 50% Mm

• 50% Mm 50% mm

• 25% MM, 50% Mm, 25% mm

Two heterozygous daisies are crossed. If yellow is dominant over white, what are the expected phenotypic results?

• 100% yellow

• 75% yellow, 25% white

• 50% yellow, 50% white

• 25% yellow, 75% white

I would draw a dihybrid cross for a situation in which there are:

• two parents

• two traits

• two alleles

• two chromosomes