BIOS 105 Chapter 12 - particulate inheritance is correct? a. Genes re...

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BIOS 105 Chapter 12

• Which of the following statements about the theories of blending inheri- tance and

particulate inheritance is correct?

• Genes remain stable across generations according to the theory of blending inheritance, but

not according to particulate inheritance.

• Genes remain stable across generations according to the theory of partic- ulate

inheritance, but not according to blending inheritance.

• Gametes fuse during fertilization according to the theory of blending inher- itance, but not

according to particulate inheritance.

• Gametes fuse during fertilization according to the theory of particulate inheritance,

but not according to blending inheritance.

• The theory of blending inheritance applies to diploid organisms, while the theory of

particulate inheritance applies to haploid organisms.:

Answer B

• Suppose on the hypothetical planet Trantor, a plantlike creature called a zork exhibits the

characteristics of blending inheritance. Red zorks that are crossed with other red zorks produce only red offspring. White zorks that are crossed with other white zorks produce only white offspring. White zorks that are crossed with red zorks yield pink offspring. If pink offspring were backcrossed to their white parents, which of the following would be the most likely result?

• All red individuals
• All white individuals
• 3/4 white individuals, 1/4 red individuals
• 1/2 white individuals, 1/2 red individuals

e. All individuals with a color that is intermediate between white and pink:

Answer E

• If two strains of true-breeding plants that have different alleles for a certain

character are crossed, their progeny are called

• the P generation.
• the F1 generation.
• the F2 generation.
• F1 crosses.

e. F2 progeny.:

Answer B

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• The parents of individuals in the F2 generation are members of the

generation.

• P
• F1
• F2
• F3

e. M:

Answer B

• If white-eyed flies are crossed with other white-eyed flies from the same strain, the

offspring will all have white eyes. This trait can thus be said to be

• dominant.
• recessive.
• filial.
• true breeding.

e. heterozygous.:

Answer d

• Suppose Mendel had an assistant who sometimes forgot to emasculate the short plants

before placing pollen from the homozygous tall plants on the pistils of the short plant flowers. As a result, about 2/3 of the pollen that fertilized the short flowers came from short plants. What fraction of the progeny from this cross would have been tall? (Recall that the trait of tall is dominant to short.)

• 1/3
• 1/2
• 2/3
• 3/4

e. All of them:

Answer A

• Curly wing is recessive to straight wing in Drosophila. In a cross between true-breeding

curly- and straight-winged parental flies, there are 480 flies in the F2 generation. How many F2 progeny should have curly wings?

• 25
• 75
• 120
• 240

e. 360:

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Answer C

• Mendel concluded that each pea has two units for each character, and each gamete

contains one unit. Mendel's "unit" is now referred to as a

• gene.
• character.
• trait.
• genotype.

e. phenotype.:

Answer a

• In a species of mice, short hair is dominant to long hair. If a short-haired individual is

crossed with a long-haired individual and both long- and short-haired offspring result, one can conclude that

• the short-haired individual is homozygous.
• the short-haired individual is heterozygous.
• the long-haired individual is homozygous.

• the long-haired individual is heterozygous.

e. This cannot be answered without more information.:

Answer B

• Which of the following methods was not used by Mendel in his study of the genetics of

the garden pea?

• Maintenance of true-breeding lines
• Cross-pollination
• Production of hybrid plants
• Quantitative analysis of results

e. All of these methods were used.:

Answer E

• If Mendel had performed experiments on cattle rather than on peas, the patterns of

inheritance would not have been easily detectable, because cattle

• have only dominant traits.
• have small numbers of offspring.
• do not have observable phenotypes.
• are animals.

e. are diploid.:

Answer b

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