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Lecture 9

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York University
BIOL 2040
Motti Anafi

BIOL 2040 Lecture 9 The Chromosome Theory of Inheritance  Initiated with discovery of meiosis  Direct correlation with Mendel o Chromosomes are structures having to do with meiosis containing alleles that are transmitted during sexual reproduction Discovery of Sex Chromosomes  Specific combinations of chromosomes dictated the phenotype of gender o Discovery of the chromosomes was done by Stevens and Vincent o Animal Model is a meal worm  50% of the chromosomal make up is the same as in the egg  50% of the chromosome is like in the male cell o In many organisms, the sex chromosomes are XX/XY  There is a talk about this on a previous lecture Chromosomal Basis of Sex  Dictates who is male and female by chromosomes o It is noted that males have 22 pairs and 1 mismactch o It is noted that females have 23 matched pairs Morgan’s Choice of Experimental Organisms  Worked with fruit flies o Short generation time, high breeding rate o 2 week generation time  Wild type or abnormal o They have the system of dominant or recessive
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