Chapter 3: Heredity Test

What makes up chromosomes?

• male and female sex cells.

• many genes joined together.

• two pairs of alleles.

• heterozygous and homozygous alleles

Traits are controlled by

• parents.

• dominants.

• hybrids.

• genes.

Who studied different characteristics in cross-pollinated plants in his genetic experiments?

• Reginald Punnett

• Gregor Mendel

• Charles Darwin

• Kurt Nielsen

A homozygous organism has

• three different alleles for a trait.

• two identical alleles for a trait.

• only one allele for a trait.

• two different alleles for a trait.

When a parent cell divides twice to produce sex cells it is called

• mitosis

• meiosis

• a party

• cell cycle

Genes are carried from parents to their offspring on structures called

• chromosomes

• allelles

• chromatids

• mitochondria

Chromosomes may have different ____________ for each gene.

• chromatids

• recessives

• alleles

• dominants

The genetic make up of an organism refers to its ________.

• phenotype.

• genes.

• genotype.

• physical traits.

For an organism to be homozygous it must have two __________ alleles for that trait.

• different

• identical

• phenotype

• genotype

Phenotype refers to an organisms _______________.

• genetic makeup.

• acquired traits.

• physical traits.

• codominence.