Genetics Quiz

What are genes?

• The basic units of heredity that control traits.

• Structures that help cells move.

• The energy source for cell activities.

• The protective layer around a cell nucleus.

How many chromosomes do most human cells contain?

• 23 chromosomes

• 46 chromosomes

• 92 chromosomes

• 12 chromosomes

What did Mendel's garden-pea experiment demonstrate about genes?

• Genes are found in specific locations on chromosomes.

• Genes are not related to traits.

• Genes are only inherited from the male parent.

• Genes can be created during reproduction.

How many copies of the same gene for a given trait does each organism receive in sexual reproduction?

• One copy from the male parent only.

• Two copies from the female parent only.

• One copy from each parent.

• Two copies from each parent.

What is the main idea presented in this text?

• Chromosomes are the only important aspect of heredity.

• Genes are not important in determining traits.

• Information contained in the genes from each parent results in an individual's inherited traits.

• Mendel's garden-pea experiment was inconclusive.

Which chromosome is smaller and carries fewer genes?

• X chromosome

• Y chromosome

• Both are the same size

• The size and gene content are not specified

What determines an organism's genotype?

• The number of chromosomes in the nucleus

• The traits that the organism expresses

• The combination of genes received from each parent

• The shape of the chromosomes

What will be the phenotype of a pea plant with a genotype for a hybrid of green and yellow pea pods, assuming green is dominant?

• Yellow

• Green

• Both green and yellow

• The phenotype cannot be determined

Who discovered the X and Y chromosomes?

• Charles Darwin

• Gregor Mendel

• Thomas Hunt Morgan

• Rosalind Franklin

What combination of sex chromosomes determines a female in humans?

• XY

• XX

• YY

• X only