Genes and Punnett Squares

Front

What is a phenotype?

Back

The physical trait of an organism.

Front

What does genotype refer to?

Back

The possible combination of alleles in a gene.

Front

Which of the following is a phenotype? BB, Bb, bb, or Blue eyes?

Back

Blue eyes.

Front

What is an allele whose trait only shows up when no dominant allele is present?

Back

Recessive allele.

Front

What does Tt represent in terms of genotype?

Back

Heterozygous.

Front

What is a dominant allele?

Back

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

Front

Define homozygous.

Back

Having two identical alleles for a particular gene.

Front

Define heterozygous.

Back

Having two different alleles for a particular gene.

Front

What is the purpose of a Punnett square?

Back

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

Front

What does it mean if an organism is homozygous dominant?

Back

It has two dominant alleles for a trait.