Question

There are two sets of chromosomes in a zygote.
A. True
B. False

Answer 1

Hint: Zygote is defined as a eukaryotic cell which is formed by the fusion of male and female gametes during the event of fertilisation. It is an important cell and is needed to continue the existence of the species.

Complete answer:
The genome of the zygote is the combination of gametes from both the male and female. It is known to have all the genetic information of both parents to form a new individual. In multicellular organisms, the zygote is believed to be the earliest developmental stage, but in single-celled organisms, the zygote divides asexually by mitosis to produce individuals who are identical to each other. Gametes of the mother have X-chromosomes and the father's gamete, i.e. sperm contains either X or Y chromosomes. These sperms are variable in the determination of sex of an individual. If the sperm carrying an X-chromosome combines with an X-chromosome of the ovum, a female is formed. Male is the result of the fusion of sperms having Y-chromosome and ovum having X-chromosome. During fertilisation, male gametes combine with a female gamete to form a zygote. Therefore, zygote contains two sets of 23 chromosomes for the required 46 chromosomes in humans and the respective number in other animals as well.
Hence, the correct answer is Option (A).

Note: In a zygote, multiple mitotic divisions occur to form a multicellular organism. It is a stage that occurs post-fertilization. The zygote gets implanted into the uterus of the mother where it transforms into an embryo in the later stages of development.