#7-Dihybrid-Cross-Details
(Botany) > Principles of Inheritance & Variation

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In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant type offspring. This indicates

(1) chromosomes failed to separate during meiosis 

(2) the two genes are linked and present on the same chromosome

(3) both of the characters are controlled by more than one gene

(4) the two genes are located on two different chromosomes

 79%
From NCERT
NEET - 2016
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Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridised, then F2 segregation will show :

(1) higher number of the recombinant types

(2) segregation in the expected 9 : 3 : 3 : 1 ratio

(3) segregation in 3 : 1

(4) higher number of the parental types

 58%
From NCERT
NEET - 2007
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How many different kinds of gametes will be produced by a plant having the genotype AABbCC ?

(1) Three

(2) Four

(3) Nine

(4) Two

 65%
NEET - 2006
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How many different types of gametes can be formed by F1 progeny, resulting from the following cross:

AA BB CC X aa bb cc

(1) 3

(2) 8

(3) 27

(4) 64

 66%
AIIMS - 2004
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Grain colour in wheat is determined by three pairs of polygenes. Following the cross AABBCC (dark colour) X aabbcc (light colour), in F2 generation what proportion of the progeny is likely to resemble either parent?

(1) None

(2) Less than 5 percent

(3) One third

(4) Half

 51%
AIIMS - 2005
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