Genetics Practice Questions

Given E=free earlobes and e=attached earlobes, Which of the following does EE represent?

• recessive

• sex-linked

• homozygous

• heterozygous

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NGSS.HS-LS3-2

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Given E=free earlobes and e=attached earlobes, "E" represents the _______ allele.

• dominant

• heterozygous

• recessive

• sex-linked

B represents the gene for brown coat color in a certain species of rabbit and b represents the gene for white coat color. A breeder crosses a Homozygous Brown rabbit with a white rabbit. Which of the following represents the genotypes for these parents.

• BB X bb

• Bb X Bb

• BB X Bb

• Bb X bb

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The variety of possible gene combinations in a sexually reproducing species is due in part to the

• sorting of genes as a result of gene replication.

• sorting of genes as a result of meiosis.

• pairing of genes as a result of mitosis.

• pairing of genes as a result of differentiation

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In a certain species of plant, the allele for tallness is dominant over the allele for shortness. To determine whether a tall plant is heterozygous or homozygous, it should be crossed with a

• tall plant.

• different species of plant.

• similar size of plant.

• short plant.

In the dihybrid cross for pea plants shown, R is dominant for round peas, r is recessive for wrinkled peas, Y is dominant for yellow peas, and y is recessive for green peas. Which statement could be accurately made about the offspring of this cross?

• There is a 100% chance of having round, green peas.

• There is no chance of having any wrinkled, green peas.

• There is a 50% chance of having round, yellow peas.

• There is no chance of having any round, yellow peas.

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NGSS.HS-LS3-2

Select all that are possible allele combinations from the gametes of an organism with the genotype of AaBb.

• AB

• Ab

• Bb

• aB

• ab

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During meiosis, crossing-over may occur. Crossing-over usually results in

• fertilization and development.

• overproduction of gametes.

• variation within the species.

• production of identical offspring.

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Only red tulips result from a cross between homozygous red and homozygous white tulips. This illustrates the principle of

• independent assortment.

• incomplete dominance.

• dominance.

• segregation.

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NGSS.HS-LS3-1

When Mendel crossed round yellow peas with wrinkled green peas, what did he find out about the genes for these two traits?

• They are sorted and inherited separately.

• They are sorted and inherited together.

• They are incompletely dominant.

• They are codominant.

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