Genotypes and Pedigree Analysis

What does a square shape represent in a pedigree chart?

• A male

• A female

• A child

• A parent

What do the Roman numerals (like I, II, III) show in a pedigree?

• The number of children

• Different generations

• The age of the people

• The type of trait

What does a shaded shape in a pedigree chart mean?

• The person is a carrier of the trait

• The person has the trait being studied

• The person is a male

• The person is a female

If attached earlobes are a recessive trait, what genotype would someone with attached earlobes have?

• Ee

• EE

• ee

• Both Ee and EE

A mother has a dominant trait and a father has a recessive trait. If all their children show the dominant trait, what is the most likely genotype of the mother?

• Homozygous dominant

• Heterozygous

• Homozygous recessive

• Cannot be determined

In a family tree showing a recessive trait, a parent does not show the trait but has children who do. What is the parent's genotype?

• Homozygous dominant

• Heterozygous

• Homozygous recessive

• Cannot be determined

What are the sex chromosomes for a female?

• XY

• XX

• YY

• XO

A mother does not show a sex-linked recessive trait, but her son does. What is the mother's genotype?

• Homozygous dominant (X^R X^R)

• Heterozygous (X^R X^r)

• Homozygous recessive (X^r X^r)

• Cannot be determined