Question

Plant in which chromosomal basis of sex determination was discovered first is?
A. Rumex
B. Melandrium
C. Coccinia
D. Sphaerocarpus

Answer 1

Hint:- The sex determination in a plant is most similar to the sex determination plants. The
sex chromosomes which are present in the plants will determine the sex of the parts of the plants
alike to the plants. We can say that males are XY and XX are female. The dioecious prototypical plant
Silene latifolia. (a) Female and (b) male flowers, that is one of both the calyx and corolla will get
detached to show pistils and stamens, correspondingly.

Complete step-by-step solution:-
The sex is regulated by the chromosome of Y, that is, when there is the presence of the Y chromosome, then the sex is male in the plant of Melandirum. However, when there is no presence of the Y chromosome, then the sex is female. Melandrium album is an example of dioecious species. We can say that it shows a clear-cut correlation in the middle of the phenotypic sex and the presence of heteromorphic sex chromosomes. The plant’s Rumex, Coccinia, and Sphaerocarpus also have such type of sex determination. However, they were discovered later than Melandrium. The plant Melandrium was the one in which such a condition was discovered.
Thus, the correct answer is Melandrium.

Note:- Thus, we can say that a dioecious species with heteromorphic sex chromosomes (XY, males and XX, females), has a strong genetic commitment for sex determination is called as Melandrium
album (where 2n = 24). It is a fact that the genotype, pollen stage, cold treatment, and certain culture media are the mechanisms that are indispensable for a reproducible yield of embryos. It is said that the plants exhibited the corresponding female genetic sex when they are made to be analyzed cytologically.