Question

Select the best answer regarding fertilization:

(a) The zygote obtained from fertilization undergoes rapid meiotic divisions

(b) Fertilization is the process whereby diploid gametes fuse

(c) The cortical reaction ensures only one sperm fertilizes the egg

(d) By the time sperm binds to membrane receptors of egg, meiosis in the egg is complete

(e) Fertilization usually occurs in the ovary

Answer 1

• The answer is option. Cortical reaction causes release of corrixal grganules from rgg which prevent polyspermy. The secreted contents cause fertilisation envelope and clip off speem binding receptors and form a slow block to polyspermy

I will explain each option one by one . The zygote doesnt undergo meiosis it undergoes mitosis so that the number of cells double up and increase rapidly . In fertilisation haploid gametes fuse and not diploid.Only upon fertilisation oocyte finishes its process of meiosis. Fertilisation occurs in fallopian tube .