MONOHYBRID CROSS
The inheritance of flower color in the dog flower (Snapdragon or Antirrhinum sp.) can be understood by crossbreeding between true-breeding red-flowered (RR) and true-breeding white-flowered plants (rr). When they were crossed, F₁ (Rr) was pink. When F₁ was self-pollinated, the F₂ results were Red, Pink and White. Here the genotype ratios were exactly as expected, but the phenotype ratios have been changed. What happened was that R was not completely dominant over r and this made it possible to distinguish Rr as pink from RR (Red) and rr (White).
What will be the percentage of progeny in F₁ generation when RR (red flowered plant) is crossed with rr (white flowered plant) in the above passage?

Question

Accepted Answer

(A) 100% Rr

Answer

(B) 75% RR and 25% rr

Answer

(C) 25% RR, 50% Rr and 25% rr

Answer

(D) 25% RR and 75% rr

LIST I	LIST II
A. Dominant trait of pod colour in garden pea	I. Polygenic traits
B. The physical association of two genes on a chromosome	II. Pleiotropy
C. The traits generally controlled by three or more genes	III. Yellow
D. When a single gene exhibit multiple phenotypic expression	IV. Linkage
	V. Green

List-l (Metal)	List-II (Properties)
(A) \(Sc ^{3+}\)	(I) \(3 d^3\)
(B) \(Cr ^{3+}\)	(II) Colorless
(C) \(Cu ^{2+}\)	(III) \(3 d^8\)
(D) \(Ni ^{2+}\)	(IV) \(3 d^9\)

Answer & Solution

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