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

In a heterozygous genotype, which allele takes over in the phenotype?

Back

The dominant allele.

Front

What genotype does a hairless guinea pig have if hair is dominant?

Back

hh

Front

If B = brown fur and b = white fur, what is the probability of offspring having white fur from two heterozygous parents?

Back

25%.

Front

What does a Punnett square illustrate?

Back

The possible genetic combinations from a cross between two parents.

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles express their trait even if only one copy is present; recessive alleles require two copies to express their trait.

Front

What does homozygous mean?

Back

Having two identical alleles for a particular gene.

Front

What does heterozygous mean?

Back

Having two different alleles for a particular gene.

Front

If a trait is dominant, what does that mean for its expression?

Back

It will be expressed in the phenotype even if only one dominant allele is present.