In Humans, Identical Twins Are Possible Because

question 12

Multiple Choice

In humans, identical twins are possible because

• A)cytoplasmic determinants are distributed unevenly in unfertilized eggs.
• B)extraembryonic cells interact with the zygote nucleus.
• C)convergent extension occurs.
• D)early blastomeres can form a complete embryo if isolated.
• E)the grey crescent divides the dorsal-ventral axis into new cells.

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Definitions:

Menopause

A natural biological process in women that marks the end of menstruation and reproductive years, typically occurring in middle age.

Menstrual Cycle

The regular natural cycle of hormonal changes in the female body, preparing it for pregnancy, marked by menstruation in the absence of conception.

Ovulation

The phase of the female menstrual cycle during which a mature egg is released from the ovary.

Testosterone Decline

The gradual decrease in testosterone levels in men as they age, which can affect physical, sexual, and psychological health.