BIO 235 Exam 2 Questions and Answers
100% Solved
Linkage group Correct Answ_Alleles of different genes that are located on the same
chromosome and tend to be inherited together
Haplotype Correct Answ_a group of genes within an organism that was inherited together
from a single parent; A group of alleles of different genes on a single chromosome that are
closely enough linked to be inherited usually as a unit
Phenotypic marker Correct Answ_mark of position on chromosome that allows you to create
a map of the chromosome
How are phenotypic markers similar to highway markers? Correct Answ_They don't change
or do anything, they just help you know where you are at
How can you calculate the frequency of double crossover (DCO) events? Correct
Answ_product rule
,If the frequency of a single crossover between A and B is 12%, the frequency for B and C is
18%, what is the frequency of a double crossover between A and C? Correct
Answ_0.18*0.12 = 0.0216
21.6%
Chromosomal Interference Correct Answ_Crossovers do not occur independently
Crossover between A and B decreases the chance of a crossover between B and C
How do you calculate interference? Correct Answ_Observed frequency of DCO divided by
Expected frequency of DCO is equal to coefficient of coincidence (0.52/0.79 = 0.66)
Interference = 1 - coefficient of coincidence (1 - 0.66 = 0.34)
Deletion Correct Answ_Loss of a chromosomal agent
Duplication Correct Answ_repetition of a chromosomal segment
ectopic recombination Correct Answ_recombination between two DNA sequences at
different genomic locations.
, Inversion Correct Answ_Change in the direction of part of the genetic material along a single
chromosome (AGCCAG -> GACCGA)
Translocation Correct Answ_Segment of one chromosome becomes attached to a different
chromosome
Simple translocation Correct Answ_one-way transfer; piece of chromosome is attached to
another chromosome
Reciprocal translocation Correct Answ_two-way transfer; two different types of
chromosomes exchange pieces, producing two abnormal chromosomes w/ translocations
Deletion loop Correct Answ_the loop formed at meiosis by the pairing of a normal
chromosome and a deletion-containing chromosome
How do deletions affect people? Correct Answ_Homozygous deletions are lethal but
heterozygous deletions are not. Deletion results in poor gene production for the individual
100% Solved
Linkage group Correct Answ_Alleles of different genes that are located on the same
chromosome and tend to be inherited together
Haplotype Correct Answ_a group of genes within an organism that was inherited together
from a single parent; A group of alleles of different genes on a single chromosome that are
closely enough linked to be inherited usually as a unit
Phenotypic marker Correct Answ_mark of position on chromosome that allows you to create
a map of the chromosome
How are phenotypic markers similar to highway markers? Correct Answ_They don't change
or do anything, they just help you know where you are at
How can you calculate the frequency of double crossover (DCO) events? Correct
Answ_product rule
,If the frequency of a single crossover between A and B is 12%, the frequency for B and C is
18%, what is the frequency of a double crossover between A and C? Correct
Answ_0.18*0.12 = 0.0216
21.6%
Chromosomal Interference Correct Answ_Crossovers do not occur independently
Crossover between A and B decreases the chance of a crossover between B and C
How do you calculate interference? Correct Answ_Observed frequency of DCO divided by
Expected frequency of DCO is equal to coefficient of coincidence (0.52/0.79 = 0.66)
Interference = 1 - coefficient of coincidence (1 - 0.66 = 0.34)
Deletion Correct Answ_Loss of a chromosomal agent
Duplication Correct Answ_repetition of a chromosomal segment
ectopic recombination Correct Answ_recombination between two DNA sequences at
different genomic locations.
, Inversion Correct Answ_Change in the direction of part of the genetic material along a single
chromosome (AGCCAG -> GACCGA)
Translocation Correct Answ_Segment of one chromosome becomes attached to a different
chromosome
Simple translocation Correct Answ_one-way transfer; piece of chromosome is attached to
another chromosome
Reciprocal translocation Correct Answ_two-way transfer; two different types of
chromosomes exchange pieces, producing two abnormal chromosomes w/ translocations
Deletion loop Correct Answ_the loop formed at meiosis by the pairing of a normal
chromosome and a deletion-containing chromosome
How do deletions affect people? Correct Answ_Homozygous deletions are lethal but
heterozygous deletions are not. Deletion results in poor gene production for the individual
