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LINKED GENE AND GENETIC MAPPING

Total questions: 10

Worksheet time: 9mins

Name
Class
Date
1.

Q.

Which genes are most likely linked?

a)

genes 1 and 2

b)

genes 3 and 4

c)

genes 2 and 3

d)

genes 1 and 4

2.

Q.

The reason some linked genes may get separated during gamete formation is - - -

a)

genes aren't on the same chromosome

b)

a crossing over event shuffles the genes

c)

genes don't compliment each other well

d)

an environmental impact forces the genes to shuffle

3.

Q.

In a flower, the gene for purple flower (P) and round seed (R) are dominant over the genes for white flower and wrinkled seed. Pure breeding strains of the dominant and recessive varieties were crossed. The F1 generation then undergo test cross. What will be the ratio of the F2 generation if the genes for seed color and shape are not linked?

a)

9:3:3:1

b)

1:1:1:1

c)

1:1 and 1:1

4.

Q.

If results of recombination do NOT follow Mendel's Law of Independent Assortment, genes are likely to be - -

a)

Linked

b)

Shuffled during meiosis

c)

Inherited

d)

On seperate chromosome

5.

Q.

In maize, the gene for colored seed (C) and smooth (S) are dominant over the genes for colorless and wrinkled seed. Pure breeding strains of the dominant and recessive varieties were crossed. The F1 generation then undergo test cross. What will be the ratio of the F2 generation if the genes for seed color and shape are linked?

a)

9:3:3:1

b)

1:1 and 1:1

c)

1:1:1:1

6.

1 map unit is equal to

a)

chromosome

b)

1 mutation

c)

1% recombinant

d)

1 nm

7.

The recombinant frequency between gene F and gene G is 10.4%, the recombinant frequency between gene F and gene H is 8.0% and the recombinant frequency between gene G and gene H is 18.4%. Which is the coreect arrangement of these genes ?

a)

FGH

b)

GHF

c)

FHG

d)

HFG

8.

According to ...... , genes that are closer together on a chromosome have a higher chance of being inherited together.

a)

Gene linkage

b)

Polygenic

c)

Pleiotropy

d)

Epistasis

9.

Assume that total of 300 progenies are produced , the map distance between A and D is 18 cm, calculate the most ideal number of each recombinant progeny

a)

27

b)

29

c)

36

d)

22

10.

calculate the map distance between genes P and L

a)

27.80

b)

26.27

c)

30.30

d)

19.20