Unit 3 Review

Front

What does the genotype 'ss' mean?

Back

It means two recessive alleles.

Front

What describes why two different types of seeds were produced in a plant cross?

Back

The parent plants contained genes for round and wrinkled seeds.

Front

How many chromosomes do you inherit from each parent?

Back

23 chromosomes.

Front

Which of the following is heterozygous?

Back

Hh (different alleles).

Front

In a Punnett square crossing Bb and Bb, what percentage of offspring have brown hair?

Back

75% (3 out of 4).

Front

What is a genotype?

Back

The genetic makeup of an organism.

Front

What is a phenotype?

Back

The observable traits of an organism.

Front

What does dominant mean in genetics?

Back

A dominant allele masks the effect of a recessive allele.

Front

What does recessive mean in genetics?

Back

A recessive allele is only expressed when two copies are present.

Front

What is a Punnett square used for?

Back

To predict the genetic outcomes of a cross.