Genetics Review - Biology

Gregor Mendel used pea plants to study

• Inheritance of traits
• flowering
• cross-pollination

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If a Heterozygous Rr pea plant is crossed with a Homozygous rr pea plant, what would be the percentage that the offspring will be recessive rr?

• 50%
• 75%
• 25%

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If a Mother with Type A (Ao) blood and a father with type O (oo) blood have children, what would be the percentage that their offspring would be Type B blood?

• 50%
• 0%
• 35%

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Organisms that have 2 of the same alleles for a particular trait are said to be

• heterozygous
• hybrid
• homozygous

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When 2 dominant alleles (HB) are both expressed are said to be

• codominant
• diploid
• incomplete dominant

A pea plant that has 2 different alleles for the same trait is said to be

• Homozygous
• Heterozygous
• Phenotype

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

• 3
• 1
• 2

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How many children will have the disease? (look at the picture to help you)

• 1
• 0
• 2

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How many girls will be carriers?

• 1
• 0
• 2

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What percent of children will be normal?

• 50%
• 25%
• 0%

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