Page 5 - Genetics_FULL
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eyebrow shape
eyebrow shape
Bb
Alleles - Alternate Gene
Forms
Genes exist in alternate forms
called alleles. For example, the B b
alleles
gene that determines eyebrow alleles
shape has two alleles—one codes
for bushy eyebrows and the other
fine eyebrows.
father mother child
father mother child
Homozygous and Heterozygous Alleles
A person can inherit two of the same alleles, called homozygous. Or a person can inherit two
different alleles, called heterozygous.
B B b b B b
X
homozygous
homozygous
heterozygous
homozygous homozygous heterozygous
father mother child
father mother child
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