Genetics Key Terms and Concepts

How many pairs of chromosomes does each person have?

• 46

• 23

• 2

• 1,046,023

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

• Recessive

• Dominant

• DNA

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

• Recessive

• Dominant

• DNA

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

• Homozygous

• Heterozygous

• Monozygous

• Trizygous

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

• Homozygous

• Heterozygous

• Monozygous

• Mamazygous

Which of the following is heterozygous?

• FF

• Gg

• tt

• RR

Which of the following is homozygous recessive?

• rr

• TT

• AA

• Ff

Which of the following is homozygous dominant?

• Jj

• MM

• Rr

• ee

Which of the following is heterozygous?

• AA

• Aa

• aa

• 22

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-4

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).

• AA

• Aa

• aa

• aA