What types of plants did Mendel grow in order to understand heredity?

How many pairs of chromosomes does each person have?

The trait that will always be expressed if at least one copy of an allele is present.

The trait that will be expressed only if two copies of the allele are present.

What is it called when a gene carries two different types of alleles?

What is it called when a gene carries two of the same alleles?

For the next few questions, consider the facts that capital letters are used for dominant and lowercase letters are used for recessive traits.

Additionally, if a lowercase and an uppercase letter are paired together, the gene is heterozygous. If a gene has two lowercase letters or two uppercase letters, the gene is homozygous.

Which of the following is heterozygous?

Which of the following is homozygous recessive?

Which of the following is homozygous dominant?

Which of the following is heterozygous?

Brown eye color is dominant. Blue eye color is recessive. Select the combination of letters below that would represent a person being a purebred for brown eyes. In other words, which option represents a person having both alleles for brown eyes? (hint: think of capitalization of letters and what is used for dominant vs. recessive).

Brown eye color is dominant. Blue eye color is recessive. Select the person that is a purebred for blue eyes.