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WorksheetsLinkage mapping
Total questions: 20
Worksheet time: 52mins
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
If Crossing over is a tool for generating variation in the population, then what is the purpose of the S phase in the cell cycle
S phase is the phase in which mutations mostly occur in the DNA of the cell
S phase is the phase during which DNA is getting condensed to form a chromosome
S phase is the phase during which DNA is replicated in the cell
S phase is the phase during which the proteins needed for mitosis are prepared
The corssing over happens in which stage of Meiosis
Prophase I: Zygotene
Prophase II: Zygotene
Prophase II: Pachytene
Anaphase
Prophase I: Pachytene
The progeny of a test cross is not in a 1:1 ratio, this means
Independent assortment failed to occur
Segregation failed to occur
There was some error in data analysis, the progeny of a test cross are always 1:1
This is because of a lethal gene influence
Why is a test cross always performed when we need to map the gene distance? (2 marks)
How many progeny will be have if we have 3 genes that are being mapped?
9
8
4
6
During Meiosis at the tetrad stage the paternal chromosome and the maternal chromosome are accurately described as
Homologue sister
homologues
Non Homologue sister
Homologue non sister
sister homologues
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
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, then distance A/C is (choose the most accurate option)
equal to 0.35 mu
greater than 0.35 mu
lesser than 0.35 mu
equal to or lesser than 0.35 mu
equal to or greater than 0.35 mu
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
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 COC in this cross (1 mk)
0.01875
0.2856
0.1875
1.562
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 interference in this cross
91.26%
81.25%
18.75%
28.75%
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
What Chromosomes are to Mitosis, Chromatin is to (a)
