Genetics Review

What is the definition of phenotype?

• The physical expression of a trait

• The genetic combination of alleles

• A gene on the DNA strand

One form of a gene is called_______________

• a DNA

• a Phenotype

• a trait

• an allele

the condensed form of DNA is called________________

• an allele

• a gene

• a chromosome

• a phenotype

Which of the following will only show if two alleles are present?

• a dominant trait

• a recessive trait

In this punnett square, which is the dominant trait?

The B stands for bud.

• purple flower bud

• white flower bud

• dominant

• recessive

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A homozygous dominant dog with brown fur is crossed with a heterozygous dog with brown fur. What are the percentages of the possible genotypes?

• 100% BB

• 75% BB and 25%Bb

• 50 % BB and 50% Bb

• 50% Bb and 50% bb

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The man who studied genetics and came up with genetics is

• Watson

• Crick

• Mendel

• Darwin

having two different genes for a trait (sometimes called hybrid).

• protein

• homozygous

• heterozygous

• genotype

Colorblindness is a recessive, X chromosome sex-link disorder. Cross the parents to figure out which percentage of their offspring will be colorblind.

• 25%

• 0%

• 75%

• 50%

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In humans, skin tone is caused by 3 genes, each with 2 alleles. This is an example of

• codominance

• incomplete dominance

• polygenic inheritance

• multiple alleles

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