3_Chromosomes

3_Chromosomes - 2) Inheritance of chromosomes and DNA 15.1...

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1 2) Inheritance of chromosomes and DNA 15.1 - 15.3 and 16.1
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2 We now know that Mendel’s “hereditary factors” are located on chromosomes Fig. 15.1
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3 Early studies of meiosis showed that the behavior of chromosomes parallels the behavior of Mendel’s “factors” Both chromosomes and “factors” Present in pairs in diploid cells Segregate during meiosis Halve their copy numbers during meiosis and double their copy numbers at fertilization QuickTimeª and a YUV420 codec decompressor are needed to see this picture. BioFlix video (ch 13) from masteringbio.com
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4 Thomas Hunt Morgan ’s fruit fly experiments provided first strong evidence that genes are on chromosomes
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5 Why fruit flies? Easy to rear in lab Short generation time (~10d) Abundant offspring (100s per mating) Only 4 pairs of chromosomes Numerous mutation stocks now available
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6 Fig. 15.3
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P Generation F 1 Generation F 2 Generation Fig. 15.4
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P Generation F 1 Generation F 2 Generation P Generation F 1 Generation Ova (eggs) Sperm F 2 Generation Ova (eggs) Sperm Morgan’s explanation Fig. 15.4
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What happens when genes are located on the same chromosome? Morgan noticed that
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3_Chromosomes - 2) Inheritance of chromosomes and DNA 15.1...

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