Inheritance and genetic variation

Front

What is the definition of homozygous?

Back

Only one type of allele is present in the genotype, eg. BB or bb.

Front

The genotype is the ______________.

Back

Genetic makeup

Front

What is a segment of DNA called?

Back

gene

Front

What percent of offspring will have the recessive phenotype?

Back

25

Front

What is the definition of heterozygous?

Back

Both dominant and recessive alleles are present in the genotype, eg. Bb.

Front

What is a phenotype?

Back

The physical appearance or characteristic of an organism.

Front

What is a dominant allele?

Back

An allele that expresses its trait even in the presence of a recessive allele.

Front

What is a recessive allele?

Back

An allele that only expresses its trait when two copies are present.

Front

What is a Punnett square used for?

Back

To predict the genotypes and phenotypes of offspring from a genetic cross.

Front

What does it mean if an organism is purebred?

Back

It has identical alleles for a trait, either homozygous dominant or homozygous recessive.