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10 questions
Which conclusion is a result of Thomas Hunt Morgan’s research with fruit flies?
Chromosome assortment during meiosis is not random.
Linked genes are located on the same chromosome.
The physical distance between genes can be determined.
Genes recombine independently during mitosis.
Which observation of Morgan’s is evidence that crossing over occurs?
Linked genes are sometimes inherited separately.
Some dominant traits are always inherited together.
Inheritance of gene combinations is not random.
Fruit flies have only two groups of linked traits.
Two genes on a given chromosome that are most likely to be inherited together are
6.8 map units apart.
10 map units apart.
2 map units apart.
18.5 map units apart
Suppose that the distance between two genes on a linkage map is 7 units. The cross-over frequency between the two genes is
0.7%
7%
70%
700%
Suppose the cross-over percentages for three gene pairs are: A to B = 9.5%, B to C = 14.5%, and A to C = 5%. Which of the following sequences could represent the order of these genes on a chromosome?
CAB
ABC
CBA
ACB
If the distance between A/B is 0.12 mu and gene C is on the opposite side of A with respect to B at a distance of 0.23 mu, Which is the central gene in this map
B
A
C
Data insufficient
If the distance between A/B is 0.12 mu and gene C is on the opposite side of A with respect to B at a distance of 0.23 mu, What is the order of the gene linkage map
both A - B - C and C - B - A are possible
A - B – C
C - A – B
The linkage map cannot be detemined as the ratio is not 1:1
This is the reason why Mendel did not recognize linkage phenomenon in his experiments
He studied only pure characters
He did not have a powerful microscope
The characters he studied were present on different chromosomes
The characters he studied did show linkage but he missed it
1 map unit is equal to:
1 mutation
1 chromosome
1 nm
1% recombination
Causes genes to not segregate independently. Causes genes to be more likely to be inherited together. Represents an exception to Mendel's Law of Independent assortment.
Epistasis
Gene linkage
Codominance
Polygenic traits
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