Question

In plants, sex determination is due to
a. X chromosome
b. Y chromosome
c. A chromosome
d. B chromosome

Answer 1

Hint: It follows the common method used for the sex determination of homosapiens and large groups of animals with a little change in hierarchy. Sex chromosome is a condense chromatid, when present or absent in the cell can be the basis for the gender of the organisms. Diseases inherited by these chromosomes are known as sex-linked diseases.

Complete answer:
• In plants, sex determination is done by the Y chromosome.
• If the Y chromosome is absent the plant will be female.
• Plants like flagellaria, these are homogenic means they have two X chromosomes (XX).
• If the Y chromosome is present, then the offspring plant will be male with XY chromosomes.
• Sex determination is an issue of the differentiation of cells and tissues in one-of-a-kind parts of the same individuals.
• In dioecious species, separate male and female gametophytes germinate from spores of the equal size. Sexual dimorphism nonetheless can be extreme. In some instances, dwarf male gametophytes develop on larger female gametophytes.
• In extant seed flora, the function of sex willpower is for this reason passed from the gametophytes completely to their diploid sporophyte ‘hosts’. Seed-plant sporophytes may in the end be functionally hermaphroditic, generating each pollen (modified and distinctly reduced male gametophytes) and ovules (which comprise modified female gametophytes), or they may be male or female, producing handiest pollen or ovules.
• In contrast to non-seed flowers, seed-plant gametophytes are usually either male or female, and it's far the sporophyte that determines their sex.

Hence, the correct answer is option (B).

Note: Many dioecious species, which include those with well-advanced sex chromosomes, show ‘leaky’ or ‘inconstant’ gender expression, with the males and the females generating plants of the other gender. The quantitative distribution of gender in a population is under robust selection and can evolve hastily when occasions change with respect to time.