Genetics Probability

A plant can produce either purple flowers or white flowers. What is the probability of purple-flowered offspring if two plants that are heterozygous for purple flowers are crossed?

• 1:4

• 2:4

• 3:4

• 4:4

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What can you surmise from the labeled image?

• The genotype is heterozygous.

• White petal color is a recessive trait.

• White petal color is a dominant trait.

• The phenotype is heterozygous.

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There are two different alleles for flower color, P and p. The image shows a purple sweet pea that is labeled with its two alleles for petal color.

Which is the genotype of the sweet pea?

• heterozygous dominant

• heterozygous recessive

• homozygous dominant

• homozygous recessive

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Why did Gregor Mendel choose to use purebred plants in his experiments?

• They reproduce sexually.

• They exhibit only one form of a trait.

• They have a variety of traits.

• They reproduce asexually.

What is one of the reasons why Gregor Mendel chose to study pea plants?

• They exhibit only a single trait.

• They produce flowers.

• They grow very slowly.

• They reproduce sexually.

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Gregor Mendel crossed homozygous tall plants (TT) with homozygous short plants (tt). All the resulting offspring were tall. From these results, what conclusion did Mendel draw?

• Tallness is a dominant trait.

• The word homozygous always means dominant.

• Only dominant alleles are passed on to offspring.

• The alleles of the offspring were recessive.

Purple flowers are dominant over white flowers. A heterozygous purple flower is crossed with another heterozygous purple flower. What will the ratio of purple to white be?

• 3:1

• 1:3

• 2:2

• 4:0

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In a dihybrid cross between two heterozygous individuals (AaBb x AaBb), what is the probability of obtaining an offspring with the genotype AABB?

• A) 1/16

• B) 1/8

• C) 1/4

• D) 1/2

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If a homozygous dominant individual (AA) is crossed with a homozygous recessive individual (aa), what is the probability that their offspring will be heterozygous (Aa)?

• A) 0%

• B) 25%

• C) 50%

• D) 100%

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In a population where the allele for brown eyes (B) is dominant over blue eyes (b), what is the probability of two heterozygous individuals (Bb) having a child with blue eyes?

• A) 0%

• B) 25%

• C) 50%

• D) 75%

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