Question 1

Genes at different loci on the same chromosome can separate and recombine to form _______.

Accepted Answer

recombinan

Question 2

The ABO blood groups in humans are determined by a multiple allelic system in which IA and IB are codominant and are dominant to iO. If an infant born to a type O mother also is type O, possible genotypes for the father are

Accepted Answer

A)  O or A. 
B)  A or B. 
C)  O only. 
D)  O, A, or B. 
E)  impossible to determine. 
A)  O or A. 
B)  A or B. 
C)  O only. 
D)  O, A, or B. 
E)  impossible to determine.

Question 3

Use the following to answer questions:
Two different groups of imaginary schmoos live in geographically separated locations and rarely interbreed. On one occasion, a big-footed white schmoo does mate with a small-footed brown schmoo. Three offspring result: one big-footed brown schmoo and two small-footed brown schmoos.
-If big feet (B) in schmoos is dominant to small feet (b), the genotype of the big-footed white parent schmoo with respect to the foot gene can

Accepted Answer

A)  only be bb. 
B)  only be BB. 
C)  only be Bb. 
D)  either be bb or BB. 
E)  either be bb and Bb. 
A)  only be bb. 
B)  only be BB. 
C)  only be Bb. 
D)  either be bb or BB. 
E)  either be bb and Bb.

Question 4

What are plasmids?

Accepted Answer

A)  Small circular chromosomes containing a small number of genes. 
B)  Small segments of genes that replicate independently of the main chromosome of the cell. 
C)  Small pieces of DNA used to transfer genes between bacteria 
D)  Moveable pieces of DNA found in bacteria 
E)  All of the above 
A)  Small circular chromosomes containing a small number of genes. 
B)  Small segments of genes that replicate independently of the main chromosome of the cell. 
C)  Small pieces of DNA used to transfer genes between bacteria 
D)  Moveable pieces of DNA found in bacteria 
E)  All of the above

Question 5

When the expression of one gene depends on the expression of another gene, the genes demonstrate _______.

Accepted Answer

The answer of When the expression of one gene depends...

Question 6

The site on the chromosome occupied by a gene is called a(n)

Accepted Answer

A)  allele. 
B)  region. 
C)  locus. 
D)  type. 
E)  phenotype. 
A)  allele. 
B)  region. 
C)  locus. 
D)  type. 
E)  phenotype.

Question 7

It has been found that at a certain locus of the human genome, 200 different alleles exist in the population. Each person has at most _______ alleles.

Accepted Answer

A)  1 
B)  2 
C)  100 
D)  200 
E)  400 
A)  1 
B)  2 
C)  100 
D)  200 
E)  400

Question 8

In garden peas, the allele for tall plants is dominant over the allele for short plants. A true-breeding tall plant is crossed with a short plant, and one of their offspring is test crossed. Out of 20 offspring resulting from the test cross, about _______ should be tall.

Accepted Answer

A)  0 
B)  5 
C)  10 
D)  15 
E)  20 
A)  0 
B)  5 
C)  10 
D)  15 
E)  20

Question 9

What is the pattern of inheritance for a sex-linked allele?

Accepted Answer

A)  Every affected person has an affected parent. 
B)  Unaffected parents can produce children who are affected. 
C)  Affected parents do not produce affected children. 
D)  Unaffected mothers have affected sons and daughters who are carriers. 
E)  None of the above 
A)  Every affected person has an affected parent. 
B)  Unaffected parents can produce children who are affected. 
C)  Affected parents do not produce affected children. 
D)  Unaffected mothers have affected sons and daughters who are carriers. 
E)  None of the above

Question 10

Use the following to answer questions:
Agouti is a type of coat color pattern in mouse that cannot be expressed in albinos (white mice). A non-albino, agouti mouse that is heterozygous at the albino (A) and agouti (B) loci (AaBb) is mated to an albino mouse that is heterozygous at the agouti locus (aaBb). Non-albino mice without the dominant agouti allele (AAbb and Aabb) are black.
-What percent of the progeny do you expect to be black?

Accepted Answer

A)  0 
B)  12.5 
C)  37.5 
D)  50 
E)  100 
A)  0 
B)  12.5 
C)  37.5 
D)  50 
E)  100

Question 11

Cytoplasmic traits in certain species of trees are passed from the male plant to all of its progeny. Compare this observation to cytoplasmic inheritance in humans.

Accepted Answer

In humans, the gamete with the largest c

Question 12

In sex-linked inheritance of a recessive gene, all

Accepted Answer

A)  male offspring of a normal male and a heterozygous female carrier would show the trait. 
B)  female offspring would be carriers. 
C)  male offspring who receive the mutant X chromosome would show the trait. 
D)  female offspring who receive the mutant X would show the trait. 
E)  Both b and c 
A)  male offspring of a normal male and a heterozygous female carrier would show the trait. 
B)  female offspring would be carriers. 
C)  male offspring who receive the mutant X chromosome would show the trait. 
D)  female offspring who receive the mutant X would show the trait. 
E)  Both b and c

Question 13

In a test cross, peas of an unknown genotype are crossed with peas of a known genotype. In this example, smooth peas are the unknown and wrinkled peas are the known (rr). If half of the offspring from that cross are smooth and half are wrinkled, what is the genotype of the unknown plant?

Accepted Answer

A)  Incomplete dominance 
B)  Homozygous dominant: RR 
C)  Homozygous recessive: rr 
D)  Heterozygous: Rr 
E)  The genotype cannot be determined from the information given. 
A)  Incomplete dominance 
B)  Homozygous dominant: RR 
C)  Homozygous recessive: rr 
D)  Heterozygous: Rr 
E)  The genotype cannot be determined from the information given.

Question 14

Use the following to answer questions:
Two different groups of imaginary schmoos live in geographically separated locations and rarely interbreed. On one occasion, a big-footed white schmoo does mate with a small-footed brown schmoo. Three offspring result: one big-footed brown schmoo and two small-footed brown schmoos.
-Which statement about the inheritance of footedness in schmoos is most likely to be correct?

Accepted Answer

A)  Big is dominant to small. 
B)  Small is dominant to big. 
C)  Big and small are codominant. 
D)  Both a and c 
E)  This cannot be answered without more information. 
A)  Big is dominant to small. 
B)  Small is dominant to big. 
C)  Big and small are codominant. 
D)  Both a and c 
E)  This cannot be answered without more information.

Question 15

What fraction of offspring of the cross AaBb $\times$ AaBb is homozygous for all the dominant alleles, assuming that they are on different chromosomes?

Accepted Answer

A)  1/4 
B)  1/8 
C)  1/16 
D)  1/32 
E)  1/64 
A)  1/4 
B)  1/8 
C)  1/16 
D)  1/32 
E)  1/64

Question 16

Refer to the diagram below showing a pedigree of a sex-linked recessive trait. In generation II, female number 5 marries a man and has three children. One daughter and one son do not have the recessive trait; the other son does have the recessive trait. Based on these results, one can conclude that

Accepted Answer

A)  the mother is heterozygous for the trait. 
B)  the mother is homozygous for the trait. 
C)  a mutation has occurred. 
D)  the father is heterozygous for the trait. 
E)  the father is homozygous for the trait. 
A)  the mother is heterozygous for the trait. 
B)  the mother is homozygous for the trait. 
C)  a mutation has occurred. 
D)  the father is heterozygous for the trait. 
E)  the father is homozygous for the trait.

Question 17

The AB phenotype found in individuals with an IAIB genotype is an example of _______.

Accepted Answer

Question 18

Which of the following methods was not used by Mendel in his study of the genetics of the garden pea?

Accepted Answer

A)  Maintenance of true-breeding lines 
B)  Cross-pollination 
C)  Microscopy 
D)  Production of hybrid plants 
E)  Quantitative analysis of results 
A)  Maintenance of true-breeding lines 
B)  Cross-pollination 
C)  Microscopy 
D)  Production of hybrid plants 
E)  Quantitative analysis of results

Question 19

Use the following to answer questions:
Agouti is a type of coat color pattern in mouse that cannot be expressed in albinos (white mice). A non-albino, agouti mouse that is heterozygous at the albino (A) and agouti (B) loci (AaBb) is mated to an albino mouse that is heterozygous at the agouti locus (aaBb). Non-albino mice without the dominant agouti allele (AAbb and Aabb) are black.
-What percent of the progeny do you expect to be albino?

Accepted Answer

A)  0 
B)  12.5 
C)  37.5 
D)  50 
E)  100 
A)  0 
B)  12.5 
C)  37.5 
D)  50 
E)  100

Question 20

Which of the following is not a characteristic that makes an organism suitable for genetic studies?

Accepted Answer

A)  A small number of chromosomes 
B)  A short generation time 
C)  Ease of cultivation 
D)  The ability to control crosses 
E)  The availability of a variation for traits 
A)  A small number of chromosomes 
B)  A short generation time 
C)  Ease of cultivation 
D)  The ability to control crosses 
E)  The availability of a variation for traits

Exam 12: Inheritance, Genes, and Chromosomes

Genes at different loci on the same chromosome can separate and recombine to form _______.

The ABO blood groups in humans are determined by a multiple allelic system in which IA and IB are codominant and are dominant to iO. If an infant born to a type O mother also is type O, possible genotypes for the father are

What are plasmids?

When the expression of one gene depends on the expression of another gene, the genes demonstrate _______.

The site on the chromosome occupied by a gene is called a(n)

It has been found that at a certain locus of the human genome, 200 different alleles exist in the population. Each person has at most _______ alleles.

In garden peas, the allele for tall plants is dominant over the allele for short plants. A true-breeding tall plant is crossed with a short plant, and one of their offspring is test crossed. Out of 20 offspring resulting from the test cross, about _______ should be tall.

What is the pattern of inheritance for a sex-linked allele?

Cytoplasmic traits in certain species of trees are passed from the male plant to all of its progeny. Compare this observation to cytoplasmic inheritance in humans.

In sex-linked inheritance of a recessive gene, all

In a test cross, peas of an unknown genotype are crossed with peas of a known genotype. In this example, smooth peas are the unknown and wrinkled peas are the known (rr). If half of the offspring from that cross are smooth and half are wrinkled, what is the genotype of the unknown plant?

What fraction of offspring of the cross AaBb ×\times× AaBb is homozygous for all the dominant alleles, assuming that they are on different chromosomes?

Refer to the diagram below showing a pedigree of a sex-linked recessive trait. In generation II, female number 5 marries a man and has three children. One daughter and one son do not have the recessive trait; the other son does have the recessive trait. Based on these results, one can conclude that

The AB phenotype found in individuals with an IAIB genotype is an example of _______.

Which of the following methods was not used by Mendel in his study of the genetics of the garden pea?

Which of the following is not a characteristic that makes an organism suitable for genetic studies?

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Filters

The ABO blood groups in humans are determined by a multiple allelic system in which I^A and I^B are codominant and are dominant to i^O. If an infant born to a type O mother also is type O, possible genotypes for the father are

What fraction of offspring of the cross AaBb $\times$ AaBb is homozygous for all the dominant alleles, assuming that they are on different chromosomes?

The AB phenotype found in individuals with an I^AI^B genotype is an example of _______.