Genotype, Phenotype, & Punnett Squares

Front

What is a genotype?

Back

The possible combination of alleles in a gene.

Front

What is a phenotype?

Back

The physical expression of the genes.

Front

What does homozygous mean?

Back

Having two identical alleles for a particular gene (e.g., RR or rr).

Front

What does heterozygous mean?

Back

Having two different alleles for a particular gene (e.g., Rr).

Front

What is a Punnett square used for?

Back

To predict the probability of offspring genotypes from parental genotypes.

Front

If red petals are dominant, what is the genotype of a homozygous dominant flower?

Back

RR

Front

Which genotype represents homozygous recessive?

Back

tt

Front

What are alleles?

Back

Different forms of a gene that can exist at a specific locus.

Front

What is the probability of getting a homozygous genotype from a cross of two heterozygous parents (Rr x Rr)?

Back

50%.

Front

What does it mean if an allele is dominant?

Back

It expresses its trait even when only one copy is present.