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Assertion : When yelow bodied, white eye...

Assertion : When yelow bodied, white eyed Drosophila females were hybridised with brown-bodied, red eyeed males , and `F_(1)` progeny was intercrossed, `F_(2)` ratio deviated from `9:3:3:1`
Reason : When two genes in a dihybrid are on same chromosome, the proportion of parental gene combinations are much higher than the non-parental type

A

1:2:1 because of linkage of genes

B

9:3:3:1 because of recombination of genes

C

Deviation from 9:3:3:1 ratio because of segregation of genes

D

Deviation from 9:3:3:1 ratio because of linkage of genes

Text Solution

Verified by Experts

The correct Answer is:
D
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In a dihybrid cross, when would the proportion of parental gene combinations be much higher than non-parental types, as experimentally shown by Morgan and his group?

Assertion: When two genes in a dihybrid cross were situated on the same chromosome, the proportion of parental gene combinations were much higher than the non-parental type. Reason: This is due to the physical association or linkage of the two genes.

Morgan hybridised yellow-bodied, white-eyed females to brown-bodied red-eyed males and intercrossed their F_(1) progeny. He observed that (a) F_(2) ratio was deviated very significantly from the 9:3:3:1 ratio (b) Both genes did not segregate independently of each other (c) Recombinant types are not obtained in F_(2) generation (d) Both genes segregate independently of each other Select the correct set of statements :

Assertion: When the two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combinations is much higher than nonparental type. Reason: Higher parental gene combinations can be attributed to crossing over betweentwo genes.

Morgan hybridised yellow - bodied, white - eyed females to brown - bodued, red - eyed males and intercrossed their F_(1) progeny. He observed that (a) F_(2) ratio was deviated very significantly from the 9 : 3 : 3 : 1 ratio (b) Both genes did not segregate independently of each other (c) Recombinant types are not obtained in F_(2) generation (d) Both genes segergate in independently of each other . Select the correct set of statements :

How many non-parental gene combinations were obtained when Morgan crossed yellow bodies, white eyed female to brown bodied, red eyed male ?

In F_(2) generation, a ratio of 1:4:6:4:1 is obtained instead of 9:3:3:1, when two pairs of genes are considered, it indicates