Question

Cells formed as a result of cleavage are called as

• A. Megameres
• B. Micromeres
• C. Blastoderm
• D. Blastomeres

Answer 1

The correct option is D Blastomeres

The process of fertilization results in a diploid cell called as zygote, which develops into an embryo. The mitotic division, called as cleavage, start as the zygote moves through the isthmus of the oviduct towards the uterus and forms 2, 4, 8, 16 daughter cells called as blastomeres.

The embryo with 8 to 16 blastomeres is called as a morula. The morula continues to divide and transforms into blastocyst as it moves further into the uterus. The blastomeres in the blastocyst are arranged into an outer layer called trophoblast and an inner group of cells attached to trophoblast called the inner cell mass. The trophoblast layer then gets attached to the endometrium and the inner cell mass gets differentiated as the embryo.