Question

The first man-made plant Raphanobrassica was developed by-
a. Karpenchenko
b. Nilsson-Ehle
c. Sonneborn
d. Karpechenko

Answer 1

Hint: The past history of Distant hybridization begins with production of a hybrid between the carnation that is Dianthus cryophilic and sweet William also known as Dianthus barbatus by Thomas Fairchild in the year 1717. An interesting intergeneric hybrid named Raphanobrassica was produced by the G.Karpenchenko in 1928 by crossing radish and cabbage.

Complete answer:
> Option A. Karpenchenko -
Georgii Dmitrievich Karpenchenko was a Russian and Soviet biologist. G. D. Karpenchenko specialized in plant cytology along with it he has contributed in creating several hybrids. Out of all his contributions his seminal work on allopolyploids, culminating in his development of a fertile offspring of radishes and cabbages, and creating the first example of a new species obtained through polyploidy speciation during experiment of crossbreeding.

> Option B. Nilsson-Ehle -
Nilsson Ehle was born at Skurup, Sweden in the year 1873. He started his classical work on cereal genetics in 1909. He discovered that grain colour in wheat may be governed by one; two or three pairs of factors leading to genetic ratios of 3:1, 15:1 or 63:1 may be obtained from second generation hybrids.

> Option C. Sonneborn
Tracy Sonneborn devoted his career to the study of Paramecium and because of his contribution he was established as the world leader in biology along with genetics of the Protozoa.One of his key contributions was in demonstrating the preexisting structures in cells can be repeatedly determine the patterns of a new structures through many generations.

> Option D. Karpechenko
G. D. Karpechenko specialized in plant cytology along with it and has contributed in creating several hybrids. His name has sometimes been transliterated as Karpechenko.

Hence, the correct answer is option (A).

Note: Raphanobrassica plant was used as the male parent in the process of crosses with Brassica napus. The Plantlets were obtained by embryo rescue along with they were further multiplied in vitro by micro-propagation of nodal segments.