Lecture V - b 1 chromosome 2 X a 2 chromosome b Empty ii 2...

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Lecture V 1. Fruit Fly a. 2x2 autosome = female b. 1x2 autosome = male c. Y character not involved in sex-determination only needed for male fertility 2. Humans a. Y chromosome = male b. No Y chromosome = female 3. Z-liknked inheritance in chickens a. Females are heterogametic WZ b. Males are homogametic ZZ 4. Nondisjunction of the X-chromosomes during meiosis in Drosophila a. Both the x-chromosomes went to one cell b. Normal meiosis i. XX 1. X a. 1 chromosome b. 1 chromosome 2. X a. 1 chromosome b. 1 chromosome c. First Division nondisjunction i. XX 1. XX a. 2 chromosomes b. 2 chromosomes 2. Empty a. Empty b. Empty ii. All 4 gamates are abnormal iii. XY crossed with XX and empty 1. Leads to XXX,XXY,X0,Y0(die) d. Second Division nondisjunction i. XX 1. X a. 1 chromosome
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Unformatted text preview: b. 1 chromosome 2. X a. 2 chromosome b. Empty ii. 2 normal and 2 abnormal gametes iii. XX crossed with XY 1. Leads to XXX,XXY, X and Y (dies) [xxy will only be able to go on in the future] 5. Primary nondisjunction a. Improper segregation of chromosomes in a DIPLOID 6. Secondary nondisjunction 7. Example of disjunction in a XXY female in Drosophila a. Cross – white XXY female (wwY) x fred eye male (W + Y) 8. End of chapter 4 Missed material from Chapter 3 1. F1 AaBb (branched diagrams) a. 3:1 ratio b. 3 i. = 9/16 A-B-ii. = x/16 A-bb c. 1 i. = x/16 aaB-ii. = x/16 a-b-2. AaBbCc a. ¾ A-Chapter 5 1. Genetic Linkage and Chromosome Mapping...
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