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Exam 13: Observing Patterns in Inherited Traits

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Question 1

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There are nine coat colors known in foxes.If a red fox were crossed with a double-black fox, all the hybrids would be red above and black below in a pattern known as blended cross.If two blended crosses were mated, the F₂ ratio would be as follows: 1 red, 2 smoky red, 2 cross red, 4 blended cross, 1 standard silver, 2 substandard silver, 1 Alaskan silver, 2 sub-Alaskan silver, and 1 double black. (a) Using the letters A/a and B/b to serve as the genes for these animals, develop a genotype for each variety listed. (b) Two crosses will produce all blended-cross offspring.One is used above (red fox * double black); what is the other? (c) List the genotype and phenotype of all the pure-breeding foxes. (d) Give the genotypic and phenotypic ratio of a cross between two substandard silvers. (e) Give the genotype and phenotype of the offspring produced in a cross of a sub-Alaskan silver and a cross red.

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(a)
1 AA BB red
2 AA Bb smoky red
2 Aa B...

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Question 2

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-Using the illustration above and the assumption that half of a plant's sperm and eggs are a and half are A, one can predict that the chance of sperm a meeting egg A at fertilization is

A) 1/2 * 1/2.
B) 25 percent.
C) one out of four.
D) 1/2.
E) all of these EXCEPT 1/2.

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Question 3

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In humans, normal skin pigmentation is influenced by a dominant gene (C), which allows pigmentation to develop.All individuals who are homozygous for the recessive allele (c) are unable to produce an enzyme needed for melanin formation and are therefore referred to as albino.Two normal parents produce an albino child.What are the chances that the next child will be an albino?

-A gene that produces multiple effects is called

Which of the following is FALSE about camptodactyly?

Pure-breeding yellow guinea pigs crossed with pure-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.

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

Provide evidence for and against the now disproven concept of blended inheritance?

Mendel's dihybrid crosses, but not his monohybrid crosses, show that

A bell-shaped curve of phenotypic variation is indicative of

Which eye color has the gene combination to deposit the most melanin in the iris?

MATCHING Classification.Answer the following questions using the group of answers below. a.4 b.6 c.8 d.12 e.24 -Plant species X is diploid (2n = 24) and has a quantitative trait, the expression of which is controlled by gene loci on each of its chromosomes.What is the maximum number of alleles for this trait that any one individual of species X could have?

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?

Height, weight, and eye color are examples of phenotypes that illustrate all BUT

Which of the following can impact methylation patterns?

Crosses between a yellow rat with a yellow rat always produce yellow.Crosses between a white rat with a white rat always produce white.The alleles affect the same aspect of coat color.The crosses of a white with a yellow produce a cream.What happens if you cross two creams?

Tall (D) is dominant to dwarf (d).Give the F₂ genotypic and phenotypic ratios of a cross between a pure-breeding tall plant and a pure-breeding dwarf plant.

The CFTR protein product is responsible for:

If wire hair (W) is dominant to smooth hair (w), and you find a wire-haired puppy, how would you determine its genotype by a genetic breeding experiment? Give both the genotype and phenotype involved with the cross with the unknown.

MATCHING Classification.Answer the following questions using the group of answers below. a.4 b.6 c.8 d.12 e.24 -In a dihybrid cross between a parent that is a double heterozygote (Aa Bb) and a parent that is a double homozygous recessive (aa bb), how many unique phenotypes potentially will be present in their offspring?