Genetics Crosses

An allele whose trait always shows up in the organism when the allele is present.

• recessive allele

• dominant allele

• hidden allele

• present allele

An organism's genetic makeup

• phenotype

• genotype

• heterzygous

• allele

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A characteristic that an organism can pass on to its offspring through its genes

• protein

• trait

• DNA

• gene

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What predicts genetic outcomes?

• genetic engineering

• punnet square

• probability

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A couple has three brown-eyed children. The parents are brown-eyed (Bb). The allele for brown eyes is dominant over the allele for blue eyes. They believe the fourth child they have will be blue-eyed. Which statement below explains what actually will happen?

• The couple will have a blue-eyed fourth child.

• The couple will have a brown-eyed fourth child.

• They have a 75% chance of having a blue-eyed child.

• They have a 25% chance of having a blue-eyed child.

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A pea plant with wrinkled peas is crossed with a pea plant with smooth peas. All of the offspring produced have wrinkled peas. What can be inferred about the wrinkled pea trait?

• The wrinkled pea plant is dominant

• The wrinkled pea plant is recessive

• The wrinkled pea plant is a hybrid

• The wrinkled pea plant is codominant.

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A mother is homozygous recessive for blue eyes, while the father is heterozygous for brown eyes. What percentage of the children will have brown eyes? How many possible phenotypes and genotypes will there be?

• 25%, 2, 1

• 50%, 1, 2

• 50%, 2, 2

• 25%, 1, 2,

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Different version of genes are called what?

• Traits

• Alleles

• Genotype

• Phenotype

When two alleles are the same (ex:RR/rr) what is this known as?

• Homozygous

• Heterozygous

What is the different between dominant alleles and recessive alleles?

• Dominant- only will show up when there are two dominant alleles

• Recessive- only show up when there are two recessive alleles

• Dominant- will always show up no matter what.

• Recessive- will always show up no matter what.