Question

Which one of the following generates new genetic combinations leading to variation?

• A. Sexual reproduction
• B. Parthenogenesis
• C. Nucellar polyembryony
• D. Vegetative reproduction

Answer 1

Answer: (A)

Sexual reproduction includes gamete formation via meiosis and random fertilization of gametes. Crossing over between nonsister chromatids of homologous pairs during meiosis generates new genetic combinations in gametes followed by random fertilization to aid more genetic variations. Production of new progeny by a single parent, absence of meiosis and fertilization in vegetative reproduction leads to the production of genetically identical progeny.

Therefore, the correct answer is option A.