genotypes/phenotypes.

What is a genotype?

The genetic makeup of an organism.

What is a phenotype?

The physical traits or characteristics of an organism.

What are alleles?

Different versions of the same gene

Where are genes located?

On chromosomes.

How many alleles for each gene does a person usually inherit?

Two alleles, one from each parent.

What is a dominant allele?

An allele that masks the effect of another allele.

What is a recessive allele?

An allele that is hidden when a dominant allele is present.

What does homozygous mean?

Having two identical alleles for a gene.

What does heterozygous mean?

Having two different alleles for a gene.

Which genotype represents homozygous dominant?

AA.

Which genotype represents homozygous recessive?

aa

Which genotype represents heterozygous?

Aa

How does genotype affect phenotype?

The genotype determines which traits may appear in the phenotype.

Can two organisms have the same phenotype but different genotypes?

Yes.

Give an example of a phenotype.

Eye color, hair color, or height.