Punnet square study guide

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The form of the gene that is "stronger" and appears more often

dominant

BB, Bb, and bb are examples

genotype

The genes or instructions for a trait

genotype

is represented by letters

genotype

the expression of a gene

genotype

BB is an example of

heterozygous

would look like the dominant trait

heterozygous

bb is an example of

homozygous

would look like the recessive trait

homozygous

Being tall or short are examples

phenotype

The form of the gene that is "weaker" and can be hidden by another allele

recessive

If mom and dad both have blue eyes, what is the probability of their child having brown eyes? (B = Brown eyes, b = blue eyes)

0%

If mom is homozygous dominant and dad heterozygous, what is the probability of their child having brown eyes? (B = Brown eyes, b = blue eyes)

100 %

If mom is homozygous dominant and dad is homozygous recessive, what is the probability of their child having brown eyes? (B = Brown eyes, b = blue eyes

100 %

If mom and dad are both heterozygous, what is the probability of their child having brown eyes? (B = Brown eyes, b = blue eyes)

25%

If mom is heterozygous and dad has blue eyes, what is the probability of their child having brown eyes? (B = Brown eyes, b = blue eyes)

50 %


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