Genetics

Gregor Mendel removed the male parts from the flowers of some plants in order to

• prevent hybrids from forming.

• prevent cross-pollination.

• stimulate self-pollination.

• control crosses between plants.

When Gregor Mendel crossed a tall plant with a short plant, the F₁ plants inherited

• one allele from each parent.

• two alleles from each parent.

• three alleles from each parent.

• four alleles from each parent.

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The principles of probability can be used to

• predict the traits of the offspring of genetic crosses.

• determine the actual outcomes of genetic crosses.

• determine which species should be used in genetic crosses.

• decide which organisms are best to use in genetic crosses.

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Organisms that have two identical alleles for a particular trait are said to be

• hybrid.

• homozygous.

• heterozygous.

• dominant.

Gregor Mendel’s principles of genetics apply to

• plants only.

• animals only.

• pea plants only.

• all organisms.

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Roan cattle show co-dominance for the color of their hair. There are alleles for red hair and white hair. What would you expect a heterozygous roan bull to look like if the trait showed incomplete dominance instead?

• It would be red.

• It would be white.

• It would be spotted.

• It would be pink.

Variation in human skin color is an example of

• incomplete dominance.

• codominance.

• polygenic traits.

• multiple alleles.

If an organism’s diploid number is 12, its haploid number is

• 12

• 6

• 24

• 3

Gametes are produced by the process of

• mitosis.

• meiosis.

• crossing-over.

• replication.

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What is occurring in the figure?

• independent assortment

• anaphase I of meiosis

• crossing-over

• replication

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