What did Gregor Mendel study with the pea plants?

• cross pollination

• inheritance of traits

• flowering

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If there are 2 plants with the genotypes TT and Tt then the plants would have

• the same phenotype

• different phenotypes

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If an organism has 2 identical alleles for a particular trait then it is

• heterozygous

• homozygous

• hybrid

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Mendel’s principles of genetics apply to

• plea plants only

• plants only

• all organisms

• animals only

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A pea plant that has 2 different alleles for a trait means they are

• homozygous

• heterozygous

• purebred

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How many recessive alleles for a trait must an organism inherit in order to show that trait?

• 1

• 2

• 3

• 4

What does the law of dominance state?

• all alleles are recessive

• no alleles are dominant

• some alleles are dominant and some are recessive

what is heredity?

• the passing of traits from parents to offspring

• the study of heredity

• the study of genetics

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What is an allele?

• same forms of a gene

• different forms of a gene

• 3 letters

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If the parents are X H X h and X h Y, then what is the percentage that the children will have the recessive trait.

• 50%

• 25%

• 75%

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