Transcript Bio 130 – Quiz April 9

Bio 130 – Quiz April 9
Q 1. - Mapping the Distance Between Genes
Imagine a species with three loci thought to be on the same
chromosome. The recombination rate between locus A and locus
B is 15% and the recombination rate between locus B and locus C
is 13%. Predict the recombination rate between A and C.
A. The recombination rate between locus A and locus C is either 2% or
28%.
B. The recombination rate between locus A and locus C is probably 2%.
C. The recombination rate between locus A and locus C is either 2% or
50%.
D. The recombination rate between locus A and locus C is either 2% or
39%.
E. The recombination rate between locus A and locus C cannot be
predicted.
Q 2. - Mapping the Distance Between Genes
Imagine a species with three loci thought to be on the same
chromosome. The recombination rate between locus D and locus
E is 32% and the recombination rate between locus E and locus F
is 40%. Predict the recombination rate between D and F.
A. The recombination rate between locus D and locus F is either 8% or
72%.
B. The recombination rate between locus D and locus F is probably 8%.
C. The recombination rate between locus D and locus F is either 8% or
50%.
D. The recombination rate between locus D and locus F is either 8% or
16%.
E. The recombination rate between locus D and locus F is miniscule.
Q. 3 - Triploid species are usually sterile (unable to
reproduce), whereas tetraploids are often fertile.
Which of the following are likely good explanations of
these facts?
A. In mitosis, some chromosomes in triploids have no partner at
synapsis, but chromosomes in tetraploids do have partners.
B. In meiosis, some chromosomes in triploids have no partner
at synapsis, but chromosomes in tetraploids do have
partners.
C. In mitosis, some chromosomes in tetraploids have no partner
at synapsis, but chromosomes in triploids do have partners.
D. In meiosis, some chromosomes in tetraploids have no
partner at synapsis, but chromosomes in triploids do have
partners.