Bsc1010 Chapter 16 Part 2

Front 1

Color blindness is a recessive X-linked trait. A normal couple has a color-blind child. Who else in this family is probably color blind? 
A. the child's maternal grandfather
B. the child's maternal grandmother
C. the child's paternal grandfather
D. the child's paternal grandmother
E. the child's maternal grandmother or grandfather

Back 1

A. the child's maternal grandfather

Front 2

In Thomas Hunt Morgan's experiments, males had white eyes but females did not. What cross could you perform with his flies to obtain white-eyed females? 
A. cross the F1 offspring to each other.
B. cross an F1 female to a white-eyed male.
C. cross an F2 female with an F1 male.
D. cross an F2 female with a white-eyed male.
E. crossing either the F1 or F2 females with a white-eyed male will produce some white-eyed females.

Back 2

E. crossing either the F1 or F2 females with a white-eyed male will produce some white-eyed females.

Front 3

In Thomas Hunt Morgan's experiments, the ratio of red-eyed flies to white-eyed flies appeared to follow a simple Mendelian pattern of inheritance. What observation(s) did he make that led to his conclusion that the white-eyed trait was actually not a simple Mendelian trait? 
A. He was able to correlate the expression of white eyes to the inheritance of an X chromosome.
B. He saw that only males had white eyes.
C. He observed that the white-eyed trait was recessive.
D. He was able to correlate the expression of white eyes to the inheritance of a Y chromosome because only F2 males had white eyes and the trait is recessive.
E. He was able to correlate the expression of white eyes to the inheritance of an X chromosome because only F2 males had white eyes and the trait is recessive.

Back 3

E. He was able to correlate the expression of white eyes to the inheritance of an X chromosome because only F2 males had white eyes and the trait is recessive.

Front 4

Which of the following inheritance patterns is matched with an inaccurate molecular basis? 
A. Incomplete dominance; The protein produced by a wild-type allele affects the phenotype in a concentration-dependent manner.
B. Codominance; Two proteins are produced in heterozygotes.
C. Sex-infuenced; Hormones alter the expression of proteins encoded by dominant and recessive alleles.
D. X-linked; Hemizygotes with the recessive allele do not make a functional protein, but heterozygotes do.
E. Simple Mendelian inheritance; The protein produced by a single allele cannot produce the dominant phenotype.

Back 4

E. Simple Mendelian inheritance; The protein produced by a single allele cannot produce the dominant phenotype.

Front 5

You discover a new sunflower that has blue flowers instead of yellow. When you cross this blue variety with a common yellow variety you get blue and yellow speckled flowers. What type of inheritance pattern does this gene exhibit? 
A. incomplete dominance
B. codominance
C. simple Mendelian inheritance
D. either incomplete dominance or codominance
E. sex-influenced dominance

Back 5

B. codominance

Front 6

Which of these statements INCORRECTLY describes an example of pleiotropy? 
A. A mutation in a Cl-transport protein causes infertility and excessive mucus in the lungs.
B. A mutation in a gene for microtubule formation causes a defect in sperm motility and cilia movement in the respiratory tract.
C. A mutation in a lipid metabolism gene leads to a buildup of lipids in cells, causing blindness and paralysis.
D. A mutation in the phenylalanine hydroxylase gene can cause mental retardation and loss of motor skills.
E. A mutation in one allele for phenylalanine hydroxylase results in lower levels of this enzyme in the blood, which causes high blood levels of phenylalanine.

Back 6

E. A mutation in one allele for phenylalanine hydroxylase results in lower levels of this enzyme in the blood, which causes high blood levels of phenylalanine.

Front 7

When a single-gene mutation can have phenotypic effects at multiple stages of development, it is 
A. pleiotropic.
B. incompletely dominant.
C. recessive.
D. causing a disease.
E. codominant.

Back 7

A. pleiotropic.

Front 8

If a pink snapdragon is self-fertilized, the offspring are red, pink, or white. What type of inheritance pattern does flower color exhibit in this example? 
A. codominance
B. incomplete dominance
C. dominance
D. incomplete recessive
E. recessive

Back 8

B. incomplete dominance

Front 9

Two babies are mixed up in the hospital nursery. The blood types of Couple 1 are A and O and the blood types of Couple 2 are AB and B. Baby Joe has blood type O and Baby Jane has blood type A. Who are the parents of Baby Joe and Baby Jane? 
A. Couple 1, Baby Joe; Couple 2, Baby Jane
B. Couple 1, Baby Jane; Couple 2, Baby Joe
C. Couple 1, Baby Joe or Baby Jane; Couple 2, Baby Jane
D. Couple 1, Baby Joe or Baby Jane; Couple 2 could not be parents of either baby
E. Couple 1, Baby Joe; Couple 2, Baby Joe or Baby Jane

Back 9

C. Couple 1, Baby Joe or Baby Jane; Couple 2, Baby Jane

Front 10

What is the difference between the blood types, A, B, and O? 
A. A and B individuals have carbohydrate trees on the surface of red blood cells. O individuals do not have carbohydrate trees.
B. For each blood type, A, B, and O, there is a different sugar attachment enzyme produced.
C. A and B individuals have different modifications made to their carbohydrate tree. O individuals have no modifications made to their carbohydrate tree.
D. The glycosyl transferase gene has a different mutation in A individuals than in B individuals. O individuals have no mutations in the glycosyl transferase gene.
E. Two of these answers are correct. The glycosyl transferase gene mutations in A and B individuals prevent the removal of carbohydrate trees from the cell surface. O individuals have no mutations and therefore have no carbohydrate trees on the red blood cell surface.

Back 10

C. A and B individuals have different modifications made to their carbohydrate tree. O individuals have no modifications made to their carbohydrate tree.

Front 11

A man with pattern baldness and a woman who has no baldness have a son who develops pattern baldness. Their son has a daughter who also develops pattern baldness. They determine that her expression of this trait is not a symptom of a medical condition. If her mother does not have pattern baldness, the daughter's genotype is ________ and her mother's genotype is _____________. 
A. BB, bb
B. BB, Bb
C. bb, BB
D. Bb, Bb
E. bb, Bb

Back 11

B. BB, Bb

Front 12

A woman visits her doctor's office complaining of pattern baldness. Her mother and father do not have pattern baldness, but her brother does. The doctor is concerned that she may have the serious condition of _______, and he immediately orders blood tests to check her ________ levels. 
A. tumor of the adrenal gland, 5-dihydrotestosterone
B. tumor of the reproductive system, testosterone
C. skin cancer, 2,5 alpha-reductase
D. tumor of the adrenal gland, estradiol
E. tumor of the reproductive system, 5-dihydrotestosterone

Back 12

A. tumor of the adrenal gland, 5-dihydrotestosterone

Front 13

The color of petunia flower can be changed from red to blue by altering the pH of the soil. This is an example of 
A. norm of reaction.
B. the environment influencing the genotype.
C. codominance.
D. incomplete dominance.
E. range of inheritance.

Back 13

A. norm of reaction.

Front 14

A person who is homozygous for a mutation of the phenylalanine hydroxylase gene 
A. can lead a normal life if the environment is controlled.
B. cannot give blood.
C. will always develop mental retardation in early infancy.
D. will require phenylalanine supplements throughout life.
E. Two statements are correct. They can lead a normal life if the environment is controlled by taking phenylalanine supplements.

Back 14

A. can lead a normal life if the environment is controlled.

Front 15

_________ occurs when 50% of a protein produces a different phenotype than that produced by 100% or 0% of the protein. 
A. Incomplete dominance
B. Recessive inheritance
C. Codominance
D. Loss of function mutation
E. Hybridization

Back 15

A. Incomplete dominance

Front 16

A couple has five sons. What is the probability that their next child will be a girl? 
A. 0%
B. 25%
C. 50%
D. 75%
E. 100%

Back 16

C. 50%

Front 17

The law of independent assortment states that the two alleles of the same gene will segregate from each other during gamete formation. 

Back 17

FALSE

Front 18

Offspring receive both the alleles for a given trait from one parent. 

Back 18

FALSE

Front 19

A locus encodes different genes in different individuals of the same species. 

Back 19

FALSE

Front 20

The sex of all animals is determined by chromosomes. 

Back 20

FALSE

Front 21

If you were to examine a typical population at a single locus, you would find more copies of the wild-type allele than any other allele. 

Back 21

TRUE

Front 22

When some recessive human diseases are present in the heterozygous state, incomplete dominance occurs. 

Back 22

TRUE

Front 23

Only fathers can pass on pattern baldness to their sons. 

Back 23

FALSE

Front 24

A person with blood type O can donate blood to people of any blood type. 

 

Back 24

TRUE

Front 25

A Punnett square is best used to predict the likelihood of producing many offspring with a particular genotype. 

Back 25

FALSE

Front 26

Pea plants cannot self-fertilize because one plant has either ovaries and stamens, but not both. 

Back 26

FALSE