Genetics

This cross between flower colors demonstrates complete dominance. If red is dominant and white is recessive, what is the phenotypic ratio of red to white flowers?

• 3:1
• 1:2:1
• 2:2
• 0:4

In pea plants, height is a completely dominant trait. Tall (T) is dominant to short pea plants (t). If a heterozygous tall pea is crossed w/ a short pea, what are the genotypes of the offspring?

• 75%Tt, 25%tt
  
• 100% Tt
• 50% Tt, 50% tt
  
• 25%TT, 50%Tt, 25%tt

This test cross is an example of what type of dominance?

• Incomplete Dominance
• Complete Dominance
• Codominance
• Recessiveness

Hh x hh: How many different genotypes are possible for their offspring?

• 1
• 2
• 3
• 4

Codominance means that both forms of a trait are...

• expressed equally
• dominant
• recessive
• blended together

The term for heterozygous organisms that display two phenotypes at the same time..?

• Co-dominance
• multiple alleles
• incomplete dominance
• gene linkage

Colorblindness is an X-linked recessive disorder. A female with the genotype X^BX^b is crossed with a male who's genotype is X^bY: What is the probability that they will have a child who is color blind?

• 50%
• 25%
• 75%
• 0%

Colorblindness is an X-linked recessive disorder. A female with the genotype X^BX^b is crossed with a male who's genotype is X^bY: What is the probability that they will have a son who is color blind?

• 50%
• 25%
• 0%
• 100%

What does heterozygous mean?

• An organism that has the same alleles for a trait (TT or tt)
  
• An organism that has different alleles for a trait (Tt)
  
• When neither allele is fully dominant; mixture of parents
  
• the different forms of a trait (hair color→brown, blonde)

The inherited combination of alleles is known as the offspring's

• heredity
• genotype
• phenotype
• pedigree