Genetics Regents Review

What are the phenotype percentages of the offspring?

• 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

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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.

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This is an example of

• Complete dominance

• Mendelian Genetics

• Codominance

• Incomplete Dominance

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In a Punnett square, a lower case letter stands for a ____________ allele.

• dominant

• recessive

• homozygous

• heterozygous

Incomplete dominance means that the traits are

• expressed equally

• dominant

• recessive

• blended

One form of a gene is called_______________

• a DNA

• a Phenotype

• a trait

• an allele

If green is dominant over purple, then what is the genotype for this individual?

• Purple

• Green

• GG

• gg

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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

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Which of the following genotypes is homozygous dominant?

• Yy

• yY

• yy

• YY

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

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