Скачать или смотреть Sexual reproduction and genetic variation | Middle school biology | Khan Academy

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In sexually reproducing organisms, each parent contributes half of the genes acquired (at random) by the offspring. Individuals have two of each chromosome and hence two alleles of each gene, one acquired from each parent. These versions may be identical or may differ from each other.

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Credits:
"Jackson siblings 1977" by CBS Television [Public domain], via Wikimedia Commons: https://commons.wikimedia.org/wiki/Fi...

"The Pham Family 1960" by Mr. Pham, licensed under a Creative Commons Attribution License (CC BY-SA 4.0):
https://commons.wikimedia.org/wiki/Fi...
https://creativecommons.org/licenses/...

"Gunhild Karlsson family c 1931" by Unknown photographer for family files, acquired by FamSAC [Public domain], via Wikimedia Commons:
https://commons.wikimedia.org/wiki/Fi...

"Karyotype" by National Human Genome Research Institute [Public domain], via Wikimedia Commons:
https://commons.wikimedia.org/wiki/Fi...

"Sperm-egg" by Unknown author [Public domain], via Wikimedia Commons:
https://commons.wikimedia.org/wiki/Fi...

Chromosome diagram created with Biorender.com:
https://biorender.com/