WorksheetsRecombination
Total questions: 12
Worksheet time: 21mins
Name
Class
Date
1.
Mendel did not observe linkage due to
a)
mutation
b)
crossing over
c)
synapsis
d)
independent assortment
2.
crossing over in organisms is responsible for
a)
dominance of gene
b)
segregation of alles
c)
recombination of linked genes
d)
linkage between genes
3.
Linked genes are
a)
located on different chromosomes of the same size and shape
b)
located on the same chromosome
c)
rarely inherited together
4.
Crossing-over of parts of chromosomes:
a)
has no effect on genetic linkage
b)
usually decreases the number of genetic combinations in a population
c)
can increase the number of genetic combinations in a population
5.
Linked genes are
a)
re located near each other on the same chromosome.
b)
violate the law of independent assortment.
c)
segregate together during meiosis.
d)
All of the above.
e)
None of the above
6.
How did Morgan demonstrate crossing over?
a)
A fly that received only y+w+m+ and ywm chromosomes from her parents was able to transmit different combinations of alleles to her offspring.
b)
A fly with a gray body and red eyes (wild type) was able to produce offspring with gray bodies and white eyes.
c)
True breeding yellow, white, miniature flies always had yellow, white, miniature offspring.
d)
None of these examples demonstrate crossing over.
7.
There is 30% recombination frequency between two genes. The distance between them in unit map is:
a)
15
b)
30
c)
60
d)
80
8.
There are 80% parental and 20% recombinant in a cross. Its recombinant frequency is:
a)
80
b)
20
c)
10
d)
40
9.
Mendel did not observe linkage due to
a)
There were many chromosomes to handle
b)
chracters he studied were located on different chromosomes
c)
he did not have powerful microscope
d)
he studied pure plants
10.
The map distance between the genes A & B is 3 units between B&C 10units and between C&A 7 units.The order of the genes in the linkage map constructed on the above data
a)
A,B,C
b)
A,C,B
c)
B,C,A
d)
B,A,C
11.
Gene A, B, and C are on the same chromosome. Gene A separates from gene B 15% of the time and gene B separates from gene C 2% of the time. Which genes are most likely linked?
a)
A - B
b)
B - C
c)
A - C
d)
none of the above
12.
What is the map distance if the following offspring are produced: 345 wild, 8 wild/yellow, 10 vestigial/wild, 325 yellow/vestigial? (note: these are not given as percents!)
a)
97.3
b)
2.6
c)
18
d)
1.8
100 %
