Question

human egg has an animal pole. describe briefly the two events that take place at this pole ​

Answer 1

Explanation:

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Answer 2

Event  of  embryogenesis

Explanation:

• The first step that must happen is fertilization, which occurs when a male's sperm fuses with a female's egg during conception. Fertilization results in the formation of a one-celled embryo called a zygote, which contains a set of DNA from each parent.
• This zygote is the earliest stage of an organism. Although we all started out as one teeny tiny cell or zygote, that cell makes a bunch of copies of itself, resulting in a ball of multiple cells. This process of cell division that occurs after fertilization is called cleavage.
• Cleavage results in the formation of a hollow ball of cells called a blastula. The blastula will continue to change during a process called gastrulation, which organizes the three main tissue types of a developing organism.

• After gastrulation, your nervous system and organs began to form in a series of complex steps. Eventually, you became a recognizable human fetus that continued to grow and develop until the time you were born.

• Right after fertilization, we existed as a single-celled zygote. From a zygote we eventually became a blastula through the process of cleavage, where a cell divides, makes a copy of its DNA and then pinches in half to form two cells. Those two cells repeat this process to make four cells.

• After about seven cell divisions, the embryo has become a blastula consisting of at least 128 cells.