Mutations, Genetics, and Inheritance Questions

Question 1

Recombination occurs between ____ in homologous chromosomes?

Answer 1

Non-sister chromatids

Question 2

Recombination involves physical exchange of phenotypic information T/F?

Answer 2

False

Question 3

Chromosomal changes are the same as changes in ploidy numbers T/F?

Answer 3

False

Question 4

Exchange of genetic information between two non-homologous chromosomes occurs via

Answer 4

Translocations

Question 5

A change in nucleotide sequence “C to A (a)” produced a STOP codon in the following sequence. How many amino acids are present in the polypeptide?

AGAGGCUAaGUCAAGCUAUGG

Answer 5

2

Question 6

A change in nucleotide sequence does not produce a change in AA sequence. What are these mutations called?

Answer 6

Silent

Question 7

Which of the following enzymes methylates DNA in bacteria?

Answer 7

Methyl transferase

Question 8

UV exposure of nucleic acids produces ___ in the DNA sequence?

Answer 8

Thymine dimers

Question 9

An allele is the basic unit of transmissible hereditary information T/F?

Answer 9

False

Question 10

Orthologous genes have different functions T/F?

Answer 10

False

Question 11

Loss of function mutation results in a ___ allele?

Answer 11

Null

Question 12

Which of the following is heterozygous dominant?

Answer 12

Gg and gG

Question 13

From the crossing mentioned, how many gametes with homozygous recessive are possible, per the punnet square?

G/g x g/g

Answer 13

2

Question 14

During gamete formation the unit factors separate randomly so that each gamete receives both with equal likelihood

Answer 14

False

Question 15

Genes assort into gametes independently of each other

Answer 15

False

Question 16

The proofreading repair ability of DNA polymerase enzymes is due to ___

Answer 16

3’-5’ exonuclease activity

Question 17

In autosomal recessive mutations, the offspring receives the mutant allele from one of the parents T/F?

Answer 17

False

Question 18

In human pedigrees, unknown sex is denoted by?

Answer 18

Rhombus

Question 19

A single gene mutation causing several seeming unrelated problems is called?

Answer 19

Pleitrophy

Question 20

The trait in which is evident in the heterozygous state is called?

Answer 20

Autosomal dominant

Question 21

Sex linkage is only relevant to organisms with heterogametic sexes in which females and males are genetically identical T/F?

Answer 21

False

Question 22

In sex linkage, traits determined by the genes on X go back and forth from male to female T/F?

Answer 22

True

Question 23

X-linked dominant disorders are lethal to females because there is no good allele T/F?

Answer 23

False

Question 24

Dominance and recessive nature of the allele is relevant in Y-linked inheritance T/F?

Answer 24

False