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 a Punnett square illustrate?

Back

The possible genetic combinations of offspring from two parents.

Front

If B = brown fur and b = white fur, what is the genotype of a brown-furred offspring from two heterozygous parents?

Back

BB, Bb (possible genotypes).

Front

What is the probability of getting a white-furred offspring (bb) from two heterozygous parents (Bb x Bb)?

Back

25%.

Front

What are examples of genotypes?

Back

Aa, DD, yy.

Front

What is the genotype for a yellow plant if G = green and g = yellow?

Back

gg.

Front

In a Punnett square, what is the missing genotype if the parents are Tt and Tt?

Back

tt.

Front

What does it mean if an allele is dominant?

Back

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

Front

What does it mean if an allele is recessive?

Back

It only expresses its trait if two copies are present.