Question

State the type of parthenogenesis in which unfertilized eggs form only females.
A. Epitoky
B. Thelytoky
C. Arrhenotoky
D. Amphitoky

Answer 1

Hint: Parthenogenesis is a type of asexual reproduction in which a zygote is produced from an unfertilized egg by self-impregnation. As a result, many people refer to it as "virgin birth." Both asexual animals and plants go through parthenogenesis. Apomixis is a component of the process in plants. Many invertebrates, including scorpions, nematodes, mites, water fleas, wasps, certain bees, and other insects, go through parthenogenesis. Parthenogenesis has been seen in a variety of vertebrate creatures, including amphibians, fish, reptiles, and a few bird species.

Complete answer:
Option:1) Epitoky is the process of conversion of a sexually immature organism to its sexual maturity. It is not related to parthenogenesis. It is evident in worms like Nereis whose sexually mature form is called Heteronereis.
So, this option is not correct.
Option:2) Thelytoky is a type of parthenogenesis in which the unfertilized egg forms only females. Example-Indian snake.
Thus, this option is correct.
Option:3) Arrhenotoky is the type of parthenogenesis in which the unfertilized egg forms only males. Example-Drones in a honey bee colony..
Thus, this option is not the correct answer.
Option:4) Amphitoky is the type of parthenogenesis in which the unfertilized egg forms either males or females. Example-Aphids.
So, this option is also not correct.

Therefore, Option 2) Thelytoky is the correct answer.

Note:
Parthenogenesis is a form of self-reproduction in which the egg cells can develop even in the absence of a suitable mate. As a result, parthenogenetic animals and plants may continue to reproduce their own species without having to spend time and effort finding a suitable spouse. The woman can then utilize this time to look for food and shelter in areas where these are available.