Unit 5 Test - Biology

Genetics is the study of

• Bacteria

• Evolution

• Heredity

• Reproduction

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Brown eyes in humans is a dominant trait. We inherit dominant traits from our parents, some from our mother and some from our father, in the form of __________.

• RNA

• Gametes

• Dollars

• Alleles

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According to Mendel's __________, one copy of a gene is passed randomly from each parent to their offspring. Therefore, gametes have half the usual number of chromosomes. The __________ states that different genes are not connected. In other words, the gene for eye color is not influenced by, nor does it influence, the gene for hair color. This allows gametes to form with a random mixture of traits. The cell division that creates gametes according to these principles is known as __________.

• Law of segregation; Law of Independent Assortment; meiosis

• Law of Segregation; Law of Independent Assortment; mitosis

• Law of Independent Assortment; Law of Segregation; meiosis

• Law of Independent Assortment; Law of Segregation; mitosis

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Using the Punnett square to right, what is the probability of a dominant trait?

• 0%

• 25%

• 75%

• 100%

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Tongue rolling is dominant to the inability to roll one's tongue. Suppose that Jack, whose genotype is Rr, marries Jill, whose genotype is rr. According to the cross, what fraction of their kids will be unable to roll their tongue?

• 0/4

• 1/4

• 3/4

• 1/2

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Use the information in the Punnett square to the right to answer the following question. Consider the possible genotypes of the offspring of two heterozygous brown goats. The ratio of brown to white offspring in this case would be?

• 1:3

• 2:2

• 3:1

• 3:4

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Black and white coloration in cows is dominant to brown and white. Black and white cows were crossed over several years and the following offspring were produced: 9 black and white and 3 brown and white. What are the genotypes of the parents?

• BB x BB

• BB x bb

• Bb x bb

• Bb x Bb

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NGSS.HS-LS3-1

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The gene for red/green colorblindness in humans is sex-linked recessive and primarily affects males. It must be located on

• The X chromosome

• The Y chromosome

• Both the X and Y chromosome

• Either the X or Y chromosome

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In a cross of two flowers, red, R, is dominant and white, r, is recessive. In a cross between two white-flowered plants, what statement would BEST describe the offspring?

• 75% of the flowers would be white and the remaining 25% would be red

• There would be some variation; most flowers would be white, and a few would be red

• There would be no variation in color. All flowers will be white unless a mutation occurred.

• Flower color variation would be equally divided given the homozygous parents, half red and half white.

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Red flowers crossed with white flowers can yield pink flowers. Pink is the heterozygous condition in a trait that shows incomplete dominance. If pink flowers are crossed with white flowers, what percentage is expected to be red flowers?

• 0%

• 25%

• 50%

• 100%

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