Principles of Heredity

What makes a dominant allele different from a recessive allele?

• The dominant allele always mixes with the recessive allele.

• The dominant allele determines the trait.

• The dominant allele determines the trait.

• The recessive allele determines the trait.

Which statement is true of Y chromosomes?

• Only men have them.

• Only women have them.

• Women have two of them.

• All babies have them.

What is the name for different forms of a gene?

• Chromosomes.

• DNA.

• Homozygous.

• Alleles.

What is it called when two forms of a trait are both dominant at the same time?

• Incomplete dominance.

• Alleles.

• Codominance

• Recessive.

What determines the genotype of an organism?

• The alleles that are passed from parents to offspring

• The amount of sleep the organism gets

• The number of children the organism has

• The foods the organism eats during its life

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Which is an example of codominance?

• A cow with white hairs and a cow with black hairs mate and produce a cow with both white and black hairs.

• A person with blue eyes and a person with brown eyes mate and have a child with brown eyes.

• A sheep with white fur and a sheep with black fur mate and produce a sheep with gray fur.

• A red-flowered plant and a white-flowered plant mate and produce a pink-flowered plant.

Earlobes can be either attached or detached. The allele for attached earlobes is recessive (e), and the allele for detached earlobes is dominant (E). What must be true if a boy is born with attached earlobes?

• He has one of each allele.

• He has a heterozygous genotype.

• He has no recessive alleles.

• He has a homozygous genotype

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Which is an example of incomplete dominance?

• Two white cats having black kittens.

• A white cat and a black cat having grey kittens.

• A white cat and a black cat having white kittens.

• A grey cat and a black cat having black kittens.

What is true of the allele pair of someone with a genotype TT?

• It has two different forms of the allele for a gene.

• It is homozygous dominant.

• It is heterozygous.

• It is homozygous recessive.

Having freckles is dominant (F), and not having freckles is recessive (f). A mother has Ff and a father has Ff. If they have a child, which genotype will make their child not have freckles?

• fF

• Ff

• FF

• ff

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