Question

The number of nuclei present in a zygote is
A. None
B. One
C. Two
D. Four

Answer 1

Hint: Zygote is formed through fertilization in which the male and female gamete fuses.

Complete answer:
The word fertilization means to join. Zygote is a Eukaryotic cell which is formed by the fusion of two gametes in which the whole genetic information of both individuals is present respectively. In fungi karyogamy occurs where the formation of diploid cells takes place which is known as zygospores. In plants the term archegonia is used for formation of the zygote. In humans, one male (sperm) and female (ova) comes in contact to form a zygote and then further processes like fertilization, implantation occur and also the subdivision of zygote by cleavage occurs in many animals and even in humans too. The zygote always carries the two sets of chromosomes. When two haploid gametes meet to form a diploid zygote the process is always sexual reproduction. The zygote is said to be the first stage of the embryo where the fusion of pronuclei of male and female takes place and the fertilized ovum becomes diploid. Fertilization basically occurs in the ampulla region of a tube known as fallopian tube or oviduct. The development path of zygote is inner cell mass and trophoblast.
The product of the fertilization is zygote. It is the process in which the male gamete ‘sperms’ carries the male’s genetic material and the female gamete ‘ovum’ carries the female’s genetic material fuses together to form the zygote.
Each gamete is haploid (n) whereas zygote is diploid (2n). Zygote is single celled structure and it divides through mitosis to produce new cells which further gets differentiated or divides to form new cells which will later on get differentiated to form further organs.

The correct answer is (C) Two.

Note: The zygote is the product of fertilization and is diploid (2n) because sperm and ovum have their respective nuclei and thus have 2 nuclei.