First aid says zygote is 2n/4c? Why not 2n/2c?

[Deejay Khaled]

Sorry, maybe I'm stressing over an irrelevant point, but on page 580, FA says that during fertilization and as a zygote, the newly formed egg is 2N4C. Is this referring to mitotic division after fertilization? I would assume 1 ova + 1 sperm = 2N, 2C.

Thank you

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[iceman55]

Ova and sperm are only haploid . But once fertilization happens the zygote is diploid so two copies of each chromosome = 2n, 4c

I could be wrong, took step 1 last year, currently on that Step 2 grind.


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[Rahas]

Sperm and ovum genetic material duplicate right before forming the zygote, so the latter is initially 2n4c.