Introduction to Genetics

Why did Gregor Mendel use peas in his experiments?

• Peas grow very slowly

• Pea reproduction CANNOT be controlled

• Peas normally produce very few offspring

• Peas have characteristics that have two forms

Which has the most control of traits and inheritance?

• gametes

• nucleic acids

• amino acids

• proteins

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Which traits are visible in the F1 generation of a Mendelian cross?

• Only the dominant trait is visible

• Only the recessive trait is visible

• Neither the dominant nor receive trait is visible

• Both the dominant and recessive traits are visible

If a scientist wanted to follow Mendel’s experiment with a different kind of plant, which type of plant would she examine?

• A plant that cannot self-pollinate

• A plant that has only recessive alleles

• A plant that has three alleles for a trait

• A plant that has only two alleles for a trait

If Mendel had crossed a true breeding dominant plant with a true breeding recessive plant, in which of the three generations is the recessive trait visible?

• F1 Generation

• P Generation

• F1 and F2 generation

• P generation and F2 generation

Some people have freckles, and some people do not have freckles. If a child has freckles, at least one parent has freckles. However, the child may have a sibling that does not have freckles. Which statement best describes the presence of freckles?

• Freckles are not determined by DNA.

• There are two alleles for freckles

• There is no dominant allele for freckles

• Freckles are determined by two genes instead of by one.

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Which of Mendel's generations was allowed to self-pollinate?

• F1 generation

• P generation

• F1 and F2 generation

• P generation and F2 generation

A scientist is studying fruit fly wings. Straight wings are dominant, and curly wings are recessive. Which statement correctly describes the F1 generation if a straight-winged parent is crossed with a curly-winged parent and if both parents are true breeding?

• The offspring will have two genes for straight wings

• The offspring will produce only gametes that have genes for curly wings

• The offspring will have one allele for straight wings and one allele for curly wings

• The offspring will have only one kind of allele for the gene that determines wing type

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A pea plant exhibits a recessive trait. Which statement is most likely true about the plant?

• The plant is identical to its parent plant

• The plant has different alleles for the gene that codes for the trait

• The plant has two identical alleles for the gene that codes for the trait

• The plant does not have the same genes for the trait as its parent plant

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What were some characteristics of the F2 generation of Mendel's crosses?

• all plants had the dominant trait

• half of the plants had the dominant allele

• all plants had both the dominant and recessive alleles

• one in four plants had two alleles for the recessive trait