Does meiosis II happen before or after fertilization?

Does fertilization happen after meiosis?

Meiosis is important to, but not the same as, sexual reproduction. Meiosis is necessary for sexual reproduction to occur, as it results in the formation of gametes (sperm and eggs). However, sexual reproduction includes fertilization (the fusion between gametes), which is not part of the meiotic process.

When is meiosis II completed?

Complete answer: The meiosis-II stage is completed in oogenesis only after fertilization. When sperm enters the egg cell, the centrioles from the sperms allow the spindle formation and the completion of the meiosis-II stage occurs.

What comes first mitosis or fertilization?

During fertilization the sperm and egg unite to form a single cell called the zygote which contains chromosomes from both the sperm and egg. The zygote undergoes mitosis to begin development of the human embryo which eventually becomes a baby.

What happens first mitosis or meiosis?

Like mitosis, meiosis I initiates after S phase has been completed and the parental chromosomes have replicated to produce identical sister chromatids. … Meiosis I is followed by meiosis II, which resembles mitosis in that the sister chromatids separate and segregate to different daughter cells.

At what point is meiosis II completed for the female gamete?

The answer is c) fertilization. The female gamete stays locked in metaphase II until fertilized by the male gamete.

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When is meiosis II completed in the formation of an egg quizlet?

Completion of Meiosis at fertilization

-If fertilization occurs, the secondary oocyte will complete meiosis II to form one large ovum (fully mature) and a second polar body that gets degenerated.

How does DNA combined at conception?

When a female creates an egg or a male creates a sperm, the two strands of DNA must combine into a single strand. The sperm and egg from the mother and father each contribute one copy of each chromosome. They meet to give the new child two copies of each gene.

Which of the following occurs in meiosis II?

In meiosis II, the sister chromatids separate, making haploid cells with non-duplicated chromosomes.