Genetics

In pea plants, the tall allele is dominant to the short allele. What key would demonstrate this?

• Tall = T
  Short = S
• Tall = T
  Short = t
• Tall = t
  Short = T
• Tall = TT
  Short = tt

Which of the following genotypes is homozygous dominant?

• Yy

• yY

• yy

• YY

Which is the correct phenotype for this organism?

• BB
• blue
• green
• bb

What are the phenotype percentages of the offspring?

(A-Brown fur color; a-white fur color)

• 50 % Brown fur and 50% White fur

• 25 % Brown fur and 75% White fur

• 75 % Brown fur and 25% White fur

• 0% Brown fur and 100% White fur

One form of a gene is called_______________

• a DNA
• a Phenotype
• a trait
• an allele

Incomplete dominance means that the traits are

• expressed equally
• dominant
• recessive
• blended

If you cross a black guinea pig with a white guinea pig and the offspring are gray, what type of dominant trait would that be.

• incomplete dominance
• codominance
• codependant
• cooperative

Why are there no white rabbit babies?

• The white gene is not present in any of the babies.
• It takes two recessive genes to show the trait.
• Grey is a better color.
• Baby five will be white.

 One dog carries homozygous, long-haired traits (SS), and its mate carries homozygous short-haired traits (ss). Use a Punnett square to determine the probability of one of their offspring having long hair.

• 100%
• 75%
• 50%
• 25%

In rabbits, black fur (B) is dominant over brown fur (b). If a rabbit has brown fur, what can you conclude about its genotype?

• It is BB.
• It is Bb
• It is brown
• It is bb.