Question

Lysonization takes place ____________

(a) 7^th day after fertilization

(b) 15^th day after fertilization

(c) 1^st month after fertilization

(d) 6^th month after fertilization

I got this question in final exam.

I need to ask this question from Dosage Compensation Mechanism for X linked Genes topic in portion Chromosomes and Sex Determination of Cytogenetics

Answer 1

Right option is (b) 15^th day after fertilization

For explanation I would say: Lysonization process takes place in the 15^th day after fertilization when the embryo is 500-1000 cell stage. This inactivated one X chromosome in each cell.