Bonus Quiz Question: Exam #3

Question 1

Which of the following is NOT TRUE about mitosis and meiosis?
A.) homologous chromosomes pair during meiosis, but not mitosis
B.) the number of chromosomes is reduced from diploid to haploid during meiosis, but not during mitosis
C.) crossing over between non-sister chromatids occurs during meiosis, but not during mitosis
D.) meiosis results in two diploid daughter cells, but mitosis does not
E.) There are two rounds of division during meiosis, but only one during mitosis

Answer 1

D.) meiosis results in two diploid daughter cells, but mitosis does not

Question 2

Which of the following statements correctly describes a pair of homologous chromosomes?
A.) they carry different genes
B.) they may have different centromere positions
C.) they carry the same genes, and the same alleles
D.) they may carry different alleles of the same gene
E.) none of the above are correct

Answer 2

D.) they may carry different alleles of the same gene

Question 3

Which of the following occurs during anaphase I of meiosis?
A.) DNA replication occurs
B.) crossing-over occurs between non-sister chromatids
C.) sister chromatids separate from each other
D.) tetrads separate and dyads migrate to opposite poles
E.) tetrads align at the middle of the cell

Answer 3

D.) tetrads separate and dyads migrate to opposite poles

Question 4

House flies (Musca domestica) are diploid (2n=12). How many chromosomes will be present in a gamete produced by a house fly?
A.) 2
B.) 4
C.) 6
D.) 12
E.) 24

Answer 4

c.) 6

Question 5

In a cross between two monohybrid (heterozygous for one gene) individuals, we expect ______ of the progeny to exhibit the recessive phenotype.
A.) none
B.) 1/4
C.) 1/2
D.) 3/4
E.) all

Answer 5

b.) 1/4

Question 6

Traits (or phenotype) whose inheritance is consistent with mendel’s postulates are said to exhibit a _____ pattern of inheritance.
A.) sex dependent
B.) mutant
C.) mendelian
D.) darwinian
E.) recessive

Answer 6

C.) mendelian

Question 7

Pea plants which are heterozygous for the tall and dwarf stem height alleles (Dd) will produce gametes of which of the following genotypes).
A.) DD, Dd, and dd
B.) D and d
C.) Dd only
D.) D only
E.) d only

Answer 7

B.) D and d

Question 8

A testcross is a method to determine whether an individual displaying the dominant phenotype has a _____ genotype.
A.) dominant or recessive
B.) homozygous dominant or heterozygous
C.) homozygous recessive or heterozygous
D.) homozygous dominant or homozygous recessive
E.) heterozygous dominant or heterozygous recessive

Answer 8

B.) homozygous dominant or heterozygous

Question 9

Which of the following is the typical phenotypic ratio seen in the F2 generation of a dihybrid cross?
A.) 1:2:1
B.) 3:1
C.) 9:3:3:1
D.) 50:50
E.) 1:1:1:1

Answer 9

C.) 9:3:3:1

Question 10

Individuals that are heterozygous for two genes can produce ______ different gamete types?
A.) 1
B.) 2
C.) 3
D.) 4
E.) 5

Answer 10

D.) 4

Question 11

Brown coat color in labrador retrievers is a recessive Mendelian trait (black coat color is dominant). If two black labs are mated and produce a brown puppy, what is the probability that the next puppy they produce will also have a brown coat?
A.) 0%
B.) 25%
C.) 50%
D.) 75%
E.) 100%

Answer 11

B.) 25%

Question 12

Mendel observed that full pea pod shape is dominant over constricted pea pod shape, and green pea pod color is dominant over yellow. From a cross between two plants with constricted yellow pea pods, what proportion of the progeny will have pea pods that are full and green?
A.) 0/16
B.) 1/16
C.) 3/16
D.) 9/16
E.) there is not enough information to answer this question

Answer 12

A.) 0/16

Question 13

How many Barr bodies would you expect to observe in a cell from a human with the Karyotype 46, XX?
A.) zero
B.) one
C.) two
D.) three
E.) some cells will have one Barr body, and some cells will have none

Answer 13

B.) one

Question 14

Which of the following is NOT true of the human X and Y chromosomes?
A.) X and Y act like a homologous pair during meiosis
B.) genes located in the pseudoautosomal regions (PARs) are present on both X and Y
C.) the SRY gene is present on the Y but not on the X
D.) X and Y are both sex chromosomes
E.) X and Y are both inactivated as Barr bodies in XXY individuals

Answer 14

E.) X and Y are both inactivated as Barr bodies in XXY individuals

Question 15

If you were to perform a cross between true-breeding red-eyed Drosophila females and true-breeding white-eyed Drosophila males, which of the following would you expect to observe in the offspring?
A.) all of the female offspring would have white eyes and all of the male offspring would have red eyes
B.) all of the female offspring would have red eyes and all of the male offspring would have white eyes
C.) all of the male and female offspring would have white eyes
D.) all of the male and female offspring would have red eyes
E.) the offspring would be 25% red eye females, 25% white eye females, 25% red eye males, and 25% white eye males

Answer 15

D.) all of the male and female offspring would have red eyes

Question 16

In crocodiles, sex is determined by the temperature at which an egg is incubated. This is an example of _____
A.) environmental sex determination (ESD)
B.) genotypic sex determination (GSD)
C.) X-Chromosome inactivation
D.) isogamy
E.) dosage compensation

Answer 16

A.) Environmental Sex Determination (ESD)