Module 5 Genetics Flashcards
How many sister chromatids are present in a mitotic human cell during metaphase?
92
How many tetrads are present in a mitotic human cell during metaphase?
0
How many sister chromatids are present in a meiotic human cell during metaphase I?
92
How many tetrads are present in a meiotic human cell during metaphase I?
23
How many sister chromatids are present in a meiotic human cell during metaphase II?
46
How many tetrads are present in a meiotic human cell during metaphase II?
0
A normal meiotic division of a single parent cell (2n) will yield daughter cells whose ploidy level is given by
n
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?
B
What is the expected phenotypic ratio for a Mendelian dihybrid cross?
9:3:3:1
How many unique allelic combinations (gametes) can be expected from each parent in a Mendelian tetrahybrid cross?
16
True or False? Cross over occurs between non-sister chromatids of homologous chromosomes during Meiosis II.
False
True or False? Independent assortment of homologous chromosomes is a source of natural genetic variation.
True
True or False? X-chromosome-linked traits in human males (XY) are homozygous.
False
True or False? In a test cross, the unknown genotype is crossed with a homozygous dominant allelic combination.
False
True or False? The expected recombination frequency of alleles on homologous chromosomes is directly proportional to the physical distance (cM) between them.
True
Genetic interaction between different genes that ultimately affects the expression of a single phenotype is a characteristic of
Epistasis
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.
The girl will absolutely be a carrier.
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.
(C) Both (A) and (B) are correct statements.
Correct answer
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.
(A) For Mendelian genetics to work, each phenotype under examination must be causally related to one gene (“Mendelian factor”) only.
Correct answer
The internal chromosomal segment rearrangement that includes a cut and 180-degree rotation of the separated segment before getting reattached is a feature of
Pericentric inversion & Paracentric inversion
