Question

Cleavage was first seen by

• A. Spallanzani
• B. Aristotle
• C. Hertwig
• D. Harvey

Answer 1

The correct option is A Spallanzani

Cleavage is the process of division of a unicellular zygote into a multicellular embryo. It brings about the distribution of the cytoplasm of the zygote, amongst the blastomeres. In 1738, Swammerdam was the first one to observe the first cleavage in eggs. An Italian biologist, Spallanzani worked on animal reproduction and in the year 1780, described the first two planes of cleavage in an egg.

So, the correct answer is 'Spallanzani'.