POSTTEST: Heredity & Reproduction

What is a trait?

• the combination of genes passes on to offspring

• a physical characteristic that an organism possesses

• the part of DNA that gives instructions for what traits offspring will have

A trait that is least likely to appear in offspring is a/an...

• recessive trait

• sex cells

• sexual reproduction

________ happens when a new organism is formed from two parents.

• sexual reproduction

• sex cells

• offspring

Genes are located on chromosomes and are passed from parents to offspring in ________.

• sex cells

• second-generation

• sexual reproduction

Gregor Mendel cross-pollinated pea plants that had different traits to see what the ________ would look like.

• second-generation

• offspring

• recessive trait

Mendel noticed that recessive traits came back in the ________ plants.

• offspring

• second-generation

• sex cells

Cell division that produces sex cells is called________.

• reproduction

• mitosis

• meiosis

A/An ________ is a member of a gene pair.

• phenotype

• genotype

• allele

The genotype for a plant with two dominant alleles for height is ________.

• TT

• Tt

• tt

How many chromosomes does a human sex cell have?

• 46

• 23

• 19