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11 18 09 Notes
1. 11-18-09 Notes
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Sex Linked Traits [cont’d]
-Sex linked genes are found only on the X chromosome
Genotypes possible for males: XcY, XCY – males show trait more
frequently
Genotypes possible for males: XCXC, XCXc, XcXc
Some chromosomal systems of sex determination
-X chromosomes separated in meiosis. Every female egg has an X in it.
-Male X and Y chromosomes separated in meiosis.
-Union of sperm and egg determines gender of embryo
Hymenoptra – ants and bees
-Ploidy [number of chromosomes] determines sex. 2 sets = female,
haploid [1 set] = male
Linked Genes
-Genes that occur on the same chromosome are said to be “linked”
-These linked genes should not segregate independently
Recombinant offspring
*rewatch this section!*