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R and y genes of Maize lie very close to...

R and y genes of Maize lie very close to each other . When RRYY and rryy gneotypes are hybridised , `F_(2)` genertion will show

A

Segregation in `9.3:3:1`

B

Segregation in `3:1` ratio

C

Higher number of parental types

D

Higher number of recombinant types

Text Solution

Verified by Experts

The correct Answer is:
C
R and Y genes of Maize lie very close to each other. When RRYY and rryy genotypes are hybridised, `F_(2)` generation will show higher number of parental types due to linkage.
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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 :

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 :

Knowledge Check

  • Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridized the F_(2) segregation will show

    A
    segregation in the expectected 9:3:3:1 ratio
    B
    segregation in 3:1 ratio
    C
    higher number of parental types
    D
    higher number of the recombinant types

  • When two genes are situated very closed to each other in a chromosome

    A
    The percentage of crossing over between them is very high
    B
    Hardly any cross over are detected
    C
    No crfossing over can take place between them
    D
    Only duble cross overs can take place between them

  • The hilum and micropyle lie side by side very close to each other in

    A
    Anatropous ovule
    B
    Campylotropous ovule
    C
    Amphitropous ovule
    D
    Circinotropous ovule

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