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Exam 12: Patterns of Inheritance

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Question 31

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In humans,the sickle-cell trait is caused by a single defective allele,but sickle-cell disease only occurs in individuals that are homozygous for the sickle-cell allele.A man and woman each carry the trait,but do not have sickle-cell disease.What is the probability that their first two children will both have sickle-cell disease?

A) 1/16
B) 1/8
C) 1/4
D) 3/8
E) 1/2

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Question 32

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As a genetic counselor,you are constructing a human pedigree for a particular disease.You note that every generation shows the trait,suggesting that the trait is

A) sex-linked.
B) recessive.
C) dominant.
D) polygenic.
E) pleiotropic.

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Question 33

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Mendel used the garden ________ plant for his studies on inheritance.

The observable outward manifestation of the genes of an individual is referred to as its

If fertilization involves two gametes that contain different alleles of a given gene,the resulting offspring is

You toss a coin twice.Because the outcome of the first toss does not affect the outcome of the second toss,these 2 events are called

An allele that is present but unexpressed is

ABO blood group determination is an example of

In mice,the allele for black fur is dominant to the allele for brown fur.If a male heterozygous black mouse is crossed with a female brown mouse,what percentage of the F₁ offspring do you predict will be homozygous? (Enter the number only without the percent sign.For example,enter 100% as 100 and enter 12.5% as 12.5)

Let P = purple flowers and p = white,and T = tall plants and t = dwarf.Of the 16 possible gamete combinations in the dihybrid cross between 2 double heterozygotes,how many would produce the phenotype white,tall?

Two parents each have blood type AB,and their first child is blood type AB.What is the probability that their second child will have blood type AB? (Express the probability as a percent.Enter the number only without the percent sign.For example,enter 100% as 100 and enter 12.5% as 12.5)

In Mendel's experiments on seed color in pea plants,when a dominant yellow seed-bearing plant was crossed with a recessive green seed-bearing plant,what was the approximate phenotypic ratio among the F₂ generation?

When Mendel crossed purple-flowered pea plants with white-flowered pea plants,he never got offspring with flowers that had an intermediate color.This was counter to the theory of

Mendel performed reciprocal crosses in which he used pollen from a white-flowered plant to fertilize a purple-flowered plant and pollen from a purple-flowered plant to fertilize a white-flowered plant.What did these reciprocal crosses demonstrate?

If an individual allele has more than one effect on the phenotype,this is called

Individuals that have 2 alleles for most gene loci are best described as

If a single gene has 3 or more alternative forms,this is called

A person who has lost a large amount of blood but is still alive is found in a wrecked automobile under a highway bridge.Several people are helping the paramedics load the victim into the ambulance.After the ambulance has departed for the hospital,you overhear the following conversation from the persons who helped the paramedics."I am certain that when that guy gets to the hospital,they will transfuse him with any blood that they have in the blood bank since he has lost so much blood." The other person says,"Yeah,I bet you're right!" Having had a biology course,you know which blood could be safely given to anyone.Select it below.

Alternate forms of the same gene are called

Let R = red pigment and r = no pigment.In carnations,RR offspring make a lot of red pigment,rr offspring make no pigment and Rr offspring make a small amount of red pigment,thus appearing pink.Pink carnations are therefore an example of