Module 5 Genetics

Question 1

How many sister chromatids are present in a mitotic human cell during metaphase?

Answer 1

92

Question 2

How many tetrads are present in a mitotic human cell during metaphase?

Answer 2

0

Question 3

How many sister chromatids are present in a meiotic human cell during metaphase I?

Answer 3

92

Question 4

How many tetrads are present in a meiotic human cell during metaphase I?

Answer 4

23

Question 5

How many sister chromatids are present in a meiotic human cell during metaphase II?

Answer 5

46

Question 6

How many tetrads are present in a meiotic human cell during metaphase II?

Answer 6

0

Question 7

A normal meiotic division of a single parent cell (2n) will yield daughter cells whose ploidy level is given by

Answer 7

n

Question 8

If the heterozygotic allelic combination (AB) produces a phenotype that is the same as the homozygotic allelic combination (AA) but not the phenotype of the homozygotic allelic combination (BB), then which allele is recessive in the heterozygote?

Answer 8

B

Question 9

What is the expected phenotypic ratio for a Mendelian dihybrid cross?

Answer 9

9:3:3:1

Question 10

How many unique allelic combinations (gametes) can be expected from each parent in a Mendelian tetrahybrid cross?

Answer 10

16

Question 11

True or False? Cross over occurs between non-sister chromatids of homologous chromosomes during Meiosis II.

Answer 11

False

Question 12

True or False? Independent assortment of homologous chromosomes is a source of natural genetic variation.

Answer 12

True

Question 13

True or False? X-chromosome-linked traits in human males (XY) are homozygous.

Answer 13

False

Question 14

True or False? In a test cross, the unknown genotype is crossed with a homozygous dominant allelic combination.

Answer 14

False

Question 15

True or False? The expected recombination frequency of alleles on homologous chromosomes is directly proportional to the physical distance (cM) between them.

Answer 15

True

Question 16

Genetic interaction between different genes that ultimately affects the expression of a single phenotype is a characteristic of

Answer 16

Epistasis

Question 17

Choose the correct statement according to the following assessment from a genetic pedigree analysis: A girl’s dad has red-green color blindness (the phenotype associated with an X-linked recessive allele). Her mom is a carrier for the same allele.

Answer 17

The girl will absolutely be a carrier.

Question 18

Choose the correct statement from below.
Hide answer choices:

(A) Nondisjunction of homologous chromosomes during Meiosis I is a cause of abnormal chromosome number.

(B) Nondisjunction of sister chromatids in Meiosis II is a cause of abnormal chromosome number.

(C) Both (A) and (B) are correct statements.
Correct answer

(D) Neither (A) nor (B) is a correct statement.

Answer 18

(C) Both (A) and (B) are correct statements.
Correct answer

Question 19

Choose the correct choice from the following:
Hide answer choices:

(A) For Mendelian genetics to work, each phenotype under examination must be causally related to one gene (“Mendelian factor”) only.
Correct answer

(B) Mendelian genetic ratios will work even if more than one gene is associated with a specific phenotype.

(C) Both (A) and (B) are correct statements.

(D) Neither (A) nor (B) is a correct statement.

Answer 19

(A) For Mendelian genetics to work, each phenotype under examination must be causally related to one gene (“Mendelian factor”) only.
Correct answer

Question 20

The internal chromosomal segment rearrangement that includes a cut and 180-degree rotation of the separated segment before getting reattached is a feature of

Answer 20

Pericentric inversion & Paracentric inversion