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WorksheetsLinkage Analysis
Total questions: 12
Worksheet time: 9mins
Linkage is a phenomenon seen during.....
Mitosis
Meiosis
DNA replication
During a mutation
Crossingover occurs between
Homologous Non sisters
Homologous Sisters
Between both homologous sisters and non sisters
Occurs between different crhomosomes
What is the difference between Chromatin and Chromosomes? (1 mark)
How many genes can be mapped with the help of a double crossover?
3
2
4
either 2 or 3
How many progeny will be have if we have 3 genes that are being mapped?
9
8
4
6
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
A
B
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
A - B - C
C - A - B
both A - B - C and C - B - A are possible
The linkage map cannot be detemined as the ratio is not 1:1
A - C - B
A cross is made between vermilion (v), scute (sc), yellow body (y) fly and a wild type fly. The F1 is test crossed and the F2 progeny are as follows: + + + = 489, v sc y = 470, + sc y = 210, v + + = 218, + + y = 10, v sc + = 6, + sc + = 156, v + y = 141. What is the distance between v & sc and which is the central gene. (1 mk)
v/sc = 0.42 mu and v is the central gene
v/sc = 0.24 mu and y is the central gene
v/sc = 0.42 mu and y is the central gene
v/sc = 0.24 and v is the central gene
This is the reason why Mendel did not recognize linkage phenomenon in his experiments
The characters he studied were present on different chromosomes
He studied only pure characters
He did not have a powerful microscope
The characters he studied did show linkage but he missed it
