Midterm 2 Flashcards
Genes are considered unlinked when they are on:
1. different chromosomes
2. the same chromosomes less than 50cM apart
3. the same chromosome more than 50cM apart
a)1
b) 2
c) 3
d) 1 and 2
e) 1 and 3
e) 1 and 3
If nondisjunction of chromosome 21 occurs in meiosis II in a human male, what is the chance that a mature sperm derived from this division will receive two number 21 chromosomes?
a) 1/8
b) 1/4
c) 1/2
d) 3/4
e) none of the above
b) 1/4
Human diploid cells contain ___ chromosomes
a) 12
b) 24
c) 46
d) 92
e) 23
c) 46
The long arm of a chromosome is designated as:
a) m
b) n
c) o
d) p
e) q
e) q
An organism that carries extra sets of chromosomes is termed:
Polyploid
Polyploid species created from a hybridization between different species are known as:
Allopolyploids
what is the proportion of normal gametes when non-disjunction occurs during meiosis I?
a) 1/8
b) 1/4
c) 1/2
d) 3/4
e) 0
e) 0
what is the proportion of normal gametes when non-disjunction occurs during meiosis II?
a) 1/8
b) 1/4
c) 1/2
d) 3/4
e) 0
c) 1/2
When one segment from one chromosome is detached and reattached to a non-homologous chromosome, this is known as:
translocation
Chromsomal inversions may result in:
1. the chromosome segment being detached, flipped 180 degrees, and reattached to the existing chromosome portion
2. the order of the inverted segments genes being reversed
3. the order of the inverted segments genes being replaced with new genes
a) 1
b) 2
c) 3
d) 1 and 2
e) 1 and 3
d) 1 and 2
Mutant bacteria that cannot synthesize all necessary metabolites they need to grow are known as:
Auxotrophs
When the bacteriophage lambda integrates into the bacterial chromosome, it is known as:
a) lytic phage
b) lysogenic phage
c) lyophilized phage
d) all of the above
e) none of the above
b) lysogenic phage
During specialized transduction the phages contain:
a) only viral DNA
b) only bacterial DNA
c) both viral and bacterial DNA
d) No DNA
e) none of the above
c) both viral and bacterial DNA
Which of the following is a true statement about bacteriophage T4?
a) it is a temperate phage
b) it is a virulent phage
c) it has a lysogenic pathway
d) it integrates into the DNA of the host
e) none of the above
b) it is a virulent phage
While conducting research you notice that when DNAse is added to the medium, genetic exchange no longer occurs in your bacteria. What can you conclude about the method of genetic exchange that was occurring?
Transformation was taking place before the addition of DNAse
Why are mechanisms of genetic exchange in bacteria important in terms of evolution?
Parasexual mechanisms allow new combinations of genes to be produced
Which process relies on phage as a vehicle of DNA transport?
Transduction
Which process relies cell-to-cell contact for DNA transfer?
Conjunction
Cells that are capable of DNA uptake are known as:
a) capable
b) competent
c) conjugative
d) universal recipient
e) none of these
b) Competent
In bacteria, recombination may occur between:
The main chromosome of the recipient and a fragment of the donor.
In genetics, interference calculates the probability that a crossover event affects the occurrence of another such event
Correct
Non-disjunction can occur during mitosis
Correct
Gynadromorphs are originated due to non-disjunction during meiosis
Incorrect
In humans, the structure of chromosome 2 is the result of a Robertsonian fusion
Correct
