Question 1

Heritable units of information about traits are called __________.

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Question 2

__________ refers to an individual's observable traits.

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Question 3

In sweet peas, dominant allelesC and P are necessary for colored flowers. In the absence of either (__ pp or cc __) or both (cc pp), the flowers are white. Give the probable genotype of a plant with colored flowers and a plant with white flowers that produced 38 plants with colored flowers and 42 plants with white flowers.

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Question 4

A cross of two Kerry horses always produces Kerry offspring. A cross of a Kerry with a Dexter produces 1/2 Kerry and 1/2 Dexter offspring. Crosses of two Dexters produce two Dexters for every Kerry. Explain.

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Question 5

In a certain breed of chicken, two genes control color. A dominant allele (I) inhibits the expression of any color gene (C). The recessive allele (c) results in albinism when homozygous (cc). Give the F2 phenotypic ratio of a cross between a colored chicken (ii CC) with a white chicken (II cc).

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Question 6

If you were following the inheritance patterns of two different sets ofe multiple alleles located on different chromosomes, how many different possible gametes could be produced if locus 1 had five possible alleles and locus 2 had six alleles?

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Question 7

In horses, there are four alleles at the A locus. Arranged in dominance sequence they are:
A (wild), ab (bay), ac (brown), ad (black)
​.If you bred several bay mares whose sires were brown to a brown stallion whose sire was black, what are the genotypes of the parents; what type of offspring would be produced; and in what proportion?

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Question 8

In the late 1920s, a mutation occurred in many silver fox farms around the world. The fox farms that sold expensive furs were proud of the quality of their furs, and each advertised that it had the best, purest breed of all the fox farms. The new mutations produced a "platinum" coat pattern that was commercially desirable, so the farms crossed them to get more. The results of their breeding experiments were as follows: (1) silver ´ silver >>> all silver offspring; (2) silver ´ platinum >>> equal numbers of silver and platinum; (3) platinum ´ platinum >>> two platinum for each silver offspring. Explain.

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Question 9

The offspring of a cross between two individuals that breed true for different forms of a trait are __________.

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Question 10

An individual that has two dominant alleles for a trait (AA) is __________.

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Question 11

Classically, nature and nurture have been considered as two very separate factors impacting phenotype. Considering what we have learned of methylation, is this always the case?

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Question 12

Mendel's monohybrid experiment results led to his law of __________.

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Question 13

A homozygous recessive where "A" represents the trait has two recessive alleles symbolized by __________.

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Question 14

Explain what genetic 'trick' could have confounded Mendel is his recognition of segregation?

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Question 15

Different molecular forms of the same gene are __________.

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Question 16

White fruit color in summer squash is influenced by a dominant allele W, whereas colored fruit must be ww. In the presence of ww, a dominant gene G results in yellow fruit, and homozygous gg results in green fruit. Give the F2 phenotypic ratios resulting from a cross of a true-breeding plant with white fruit (genotype WW GG) with a plant with green fruit.

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Question 17

__________ assorts gene pairs of homologous chromosomes independently of gene pairs on all other chromosomes.

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Question 18

A(n) __________ is a hybrid, with two nonidentical alleles (Aa).

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Question 19

True-breeding yellow guinea pigs crossed with true-breeding white ones produce only cream-colored offspring. This pattern indicates incomplete dominance. Rough hair is found to be dominant to smooth hair. Give the F1 and F2 genotypic and phenotypic ratios of a cross of a smooth, white guinea pig with a homozygous, rough, yellow guinea pig.

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Question 20

Explain how incomplete dominance can result in an apparent "blend."

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Quiz 13: Observing Patterns in Inherited Traits