Why is asexual reproduction sometimes disadvantageous?
A. It allows sedentary animals to produce offspring without mates.
B. It allows animals to produce many offspring quickly
C. It saves times and energy of gamete formation
D. It produces a genetically uniform population

Hint: All living organisms has a property to produce of its own kind by the process called reproduction. Reproduction is of two types asexual reproduction and sexual reproduction.
In asexual reproduction, the new individuals are produced by any means other than the fusion of gametes. In sexual reproduction involves the fusion of two sex gametes to form the new individuals

Complete answer: Production of offspring by a single parent without the formation and fusion of gametes is called asexual reproduction.
It involves only mitotic cell division and is referred to as somatogenic reproduction
It ensures a rapid increase in a rapid increase in numbers.
Asexual reproduction produces identical offspring commonly referred to as clones.
Since asexual reproduction does not involve meiosis and fusion of gametes, the offspring are genetically similar to parents and they do not show variations.

So the correct answer is option is D. It produces a genetically uniform population

Additional information: Asexual reproduction occurs without the formation of sex organs. It does not involve meiosis or reduction division. Asexual reproduction does not involve sexual fusion or fusion of two gametes. Zygotes are not formed.
Types of asexual reproduction – Binary Fission, Budding, spore formation, vegetative propagation.

Note: Sexual reproduction causes variation which is essential for the evolution and survival of species under diverging changes in environmental changes in environmental factors.