In Antirrhinum
(dog flower), phenotypic ratio in F2 generation for the
inheritance of flower colour would be
In Antirrhinum (dog flower), phenotypic ratio in F2 generation for the inheritance of flower colour would be
The correct option is A 1:2:1
The inheritance
of flower colour in the Antirrhinum majus (snapdragon or
dog flower) is an example of incomplete or partial dominance.
Incompleted dominance is the phenomenon in which neither of the
two alleles of a gene is completely dominant over the other. In
a cross between true-breeding red-flowered (RR) and
true-breeding white-flowered plants (rr), the F1 plants
obtained were pink (Rr) coloured. When
the F1 plants were self-pollinated, the
F2 generation resulted in the ratio, 1 (RR) Red :2
(Rr) Pink: 1 (rr) White. The phenotypic ratios had changed from
the normal 3 : 1 dominant : recessive ratio to 1: 2: 1. R was
not completely dominant over rand this made it possible to
distinguish Rr (pink) from RR (red) and rr (white).
So, the correct answer is '1:2:1'.
The inheritance of flower colour in the Antirrhinum majus (snapdragon or dog flower) is an example of incomplete or partial dominance. Incompleted dominance is the phenomenon in which neither of the two alleles of a gene is completely dominant over the other. In a cross between true-breeding red-flowered (RR) and true-breeding white-flowered plants (rr), the F1 plants obtained were pink (Rr) coloured. When the F1 plants were self-pollinated, the F2 generation resulted in the ratio, 1 (RR) Red :2 (Rr) Pink: 1 (rr) White. The phenotypic ratios had changed from the normal 3 : 1 dominant : recessive ratio to 1: 2: 1. R was not completely dominant over rand this made it possible to distinguish Rr (pink) from RR (red) and rr (white).
So, the correct answer is '1:2:1'.
