AP Biology Chapter 14 Quiz

For some plants, their flower color is based on the soil's pH. This is an example of how the environment can alter

• Development

• Speciation

• Gene expression

• Reproduction

• Growth

An organism with genotype QqRr only produces two gamete genotypes, QR and qr. This violates which principle of Mendelian genetics?

• Codominance

• Dominance

• Independent Assortment

• Linkage

• Segregation

In fruit flies (Drosophila), vestigial wings (v) are recessive to normal wings (V). What phenotype(s) of offspring would you expect from the following cross, Vv x vv?

• Four vestigial wings

• Three normal and one vestigial

• Four normal wings

• Three vestigial and one

• Two vestigial and two normal wings

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In humans, brown eyes (B) are dominant over blue (b). If a man who is homozygous for brown eyes has children with a woman who is heterozygous for blue eyes, the phenotype of their children will be

• homozygous recessive and heterozygous

• recessive

• heterozygous

• dominant

• homozygous dominant and heterozygous

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When a homozygous recessive organism is crossed with a heterozygous dominant organism, what percent of the progeny will be heterozygous dominant?

• 75%

• 25%

• 50%

• 100%

• 0%

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A couple has 6 children and all of them are female. The probability that the couple's 7th child is a male is

• 6/7

• 1/2

• 1/7

• 1/6

• 1/49

Genes A, B and C are not linked. If the probability of allele A, B and C in a gamete is each 1/2, then what is the probability of alleles A, B, and C being in the same gamete?

• (1/2) + (1/2) + (1/2)

• 3 × (1/2)

• (1/2) – (1/2 × 1/2)

• (1/2) + (1/2 × 1/2)

• (1/2) × (1/2) × (1/2)

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In pea plants, assume that the trait for axial flowers (A) is dominant to terminal flowers (a), and the trait for round seeds (R) is dominant to wrinkled seeds (r). The probability of an offspring having axial flowers is 3/4 and the probability of an offspring having wrinkled seeds is 1/4. The parental genotypes are most likely represented by which of the following genotypes?

• AaRr × AaRr

• AaRr × AaRR

• AARR × AaRr

• aaRr × AaRr

• AaRr × aaRr

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B and b represent, respectively, the dominant and recessive alleles of a gene pair. Half of the F1 generation expresses the recessive condition, and the other half expresses the dominant condition. What are the most likely genotypes of the P generation?

• bb and bb

• BB and Bb

• BB and bb

• Bb and bb

• Bb and Bb

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Two plants are mated and 250 offspring are phenotypically classified. 61 plants display the recessive phenotype and 189 plants display the dominant phenotype. Assuming classical Mendelian patterns of inheritance, what are the most likely genotypes of the parent plants?

• Heterozygous and homozygous dominant

• Recessive and heterozygous

• Homozygous dominant and homozygous dominant

• Recessive and homozygous dominant

• Heterozygous and heterozygous

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