Genetics Review

Front

What percentage of the chromosomes does each puppy share with the mother?

Back

50% - Each puppy inherits half of its chromosomes from the mother.

Front

What is the chance that a baby from two brown-eyed parents (Bb) is blue-eyed?

Back

25% - Brown is dominant, so there is a 25% chance for blue eyes.

Front

Which of the following alleles is homozygous (purebred) recessive?

Back

tt - Homozygous recessive means having two recessive alleles.

Front

What does it mean to be homozygous or purebred?

Back

Having two of the same genes for a trait (TT or tt).

Front

What is a dominant trait?

Back

A trait that covers up another weaker trait.

Front

What is a recessive trait?

Back

A trait that is masked by a dominant trait.

Front

What does heterozygous mean?

Back

Having two different alleles for a trait (Tt).

Front

What is the genotype for a purebred dominant trait?

Back

TT - Two dominant alleles.

Front

What is the genotype for a purebred recessive trait?

Back

tt - Two recessive alleles.

Front

If a trait is hidden, what type of allele is it likely to be?

Back

Recessive - It is masked by a dominant allele.