https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:inheritance-and-variation/x0c5bb03129646fd6:reproduction-and-genetic-variation/v/sexual-reproduction-and-genetic-variation 2022-10-21T22:40:33.613234713Z Sexual reproduction and genetic variation 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. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/0ecb132d-2c87-4397-8afd-abb2cbfccfe8_1280_720_base.png Sexual reproduction and genetic variation 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. https://cdn.kastatic.org/ka-youtube-converted/oi6yfPgYiFk.mp4/oi6yfPgYiFk.mp4 348 Transmission of characters https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:inheritance-and-variation/x0c5bb03129646fd6:reproduction-and-genetic-variation/a/sexual-reproduction-and-genetic-variation 2026-02-27T17:50:36.702607024Z Sexual reproduction and genetic variation Review your understanding of sexual reproduction and genetic variation in this free article aligned to NGSS standards. article https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:inheritance-and-variation/x0c5bb03129646fd6:reproduction-and-genetic-variation/e/understand-sexual-reproduction-and-genetic-variation 2022-10-20T23:14:02.583749509Z Understand: sexual reproduction and genetic variation Check your understanding of sexual reproduction and genetic variation in this set of free practice questions aligned to NGSS standards. Megan Cohn exercise https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:inheritance-and-variation/x0c5bb03129646fd6:genes-proteins-and-traits/v/genes-proteins-and-traits 2024-05-09T17:42:08.599818576Z Genes, proteins, and traits Genes are specific stretches of nucleotides on a DNA molecule. Genes encode proteins, which are made up of amino acids. The order of nucleotides in a gene determines the order of amino acids in a protein. A protein’s amino acids determine its 3D shape and its functions in the cell, which, in turn, affect an organism’s traits. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/13c2afcc-cd5f-45ff-90f2-08e3c4600c8f_1280_720_base.png Genes, proteins, and traits Genes are specific stretches of nucleotides on a DNA molecule. Genes encode proteins, which are made up of amino acids. The order of nucleotides in a gene determines the order of amino acids in a protein. A protein’s amino acids determine its 3D shape and its functions in the cell, which, in turn, affect an organism’s traits. https://cdn.kastatic.org/ka-youtube-converted/tfZfLDRu39c.mp4/tfZfLDRu39c.mp4 293 Transmission of characters https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:gene-expression-and-regulation/x230b3ff252126bb6:genes-proteins-and-traits/a/genes-proteins-and-traits-hs 2026-03-26T05:20:35.16058035Z Genes, proteins, and traits Learn about how genes determine the structure and function of proteins, which influence an organism's inherited traits. article https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:inheritance-and-variation/x0c5bb03129646fd6:genes-proteins-and-traits/e/understand-genes-proteins-and-traits 2025-07-01T21:05:20.470958635Z Understand: genes, proteins, and traits Check your understanding of genes, proteins, and traits in this set of free, standards-aligned practice questions. Khan Academy exercise