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Exam 5: Extensions of Mendelian Inheritance

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Question 1

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Human blood groups are determined by antigens on the surface of red blood cells.

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Question 2

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In an epistatic interaction,the genes must be located on the same chromosome.

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Alleles that cause death in a certain temperature range are examples of ________.

A heterozygote possesses a phenotype that is intermediate between the homozygous dominant and homozygous recessive phenotypes.This is most likely an example of ________.

Huntington disease in humans is an example of ________.

Variable expressivity means that the phenotype of a trait can vary between individuals.

Because loss-of-function alleles typically do not make a functional gene product,they usually follow the recessive allele inheritance pattern.

Genes that are not required for survival,but are likely to be beneficial to the organism,are called ________.

In four-o'clock plants,red flower color is dominant to white flower color.However,heterozygous plants have a pink color.If a pink-flowered plant is crossed with a white-flowered plant,what will be the phenotypic ratios of their offspring?

A ________ allele encodes a protein that is made in the proper amount and functions normally.

Epistasis is ________.

At the molecular level,type A and type B blood differ in which of the following characteristics?

In a dihybrid cross of two heterozygous individuals,you expect a 9:3:3:1 phenotypic ratio in the offspring,but observe a ratio of 9:7.What is the most likely explanation?

When wild-type offspring are produced from a cross between parents that both display the same recessive phenotype,this illustrates the genetic phenomenon of ________.

Incomplete penetrance indicates that individuals who possess a dominant trait always express the trait.

An individual with type A blood and an individual with type B blood mate and have offspring.What blood type is not possible in their offspring?

Typically,a recessive allele increases the expression of a functional protein.

Sickle-cell anemia in humans is an example of ________.

Paralogs are often functionally redundant and can compensate for the loss of either of the paralogs in a set.

In rabbits,full coat color (C) is the dominant trait.A second allele,chinchilla (cᶜʰ) ,is recessive to full coat color.Himalayan coat color (cʰ) is recessive to chinchilla and full coat colors,and albino (c) is recessive to all coat colors.If two chinchilla rabbits mate,what coat color is not possible in their offspring?