modern genetics. sex determination sex chromosomes: determine male or female male: xy female: xx

MODERN GENETICS

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MODERN GENETICS

SEX DETERMINATION• Sex Chromosomes: Determine male or female

• Male: XY

• Female: XX

https://www.youtube.com/watch?v=YQyOgcGxn70

CHROMOSOMESAutosomes: Chromosomes that don’t determine sex.

(hair, eyes, etc.)

https://www.youtube.com/watch?v=-jz5znsygn0

Page 4: MODERN GENETICS. SEX DETERMINATION Sex Chromosomes: Determine male or female Male: XY Female: XX

SEX CHROMOSOMES• Human Sex Chromosomes: 23rd pair of chromosomes

(XX – Female, XY- Male)

https://www.youtube.com/watch?v=kMWxuF9YW38

SEX LINKED TRAITS (COLOR BLINDNESS)• Definition: trait carried on the sex chromosomes (x

chromosome)

SEX LINKED TRAITS• Expression: (Color blindness)

• XX: Female (not afflicted) (normal)

• X-Y: Male (afflicted)

• X-X: Female (not afflicted) (carrier)

• XY: Male (not afflicted) (normal)

• X-X-: female (afflicted)

https://www.youtube.com/watch?v=FKSOe5NK_qQ

Page 7: MODERN GENETICS. SEX DETERMINATION Sex Chromosomes: Determine male or female Male: XY Female: XX

GENE LINKAGE• 2 traits / Same chromosome

Example: Red hair / Freckles

Page 8: MODERN GENETICS. SEX DETERMINATION Sex Chromosomes: Determine male or female Male: XY Female: XX

CROSSING OVER• Combination and Variation

Page 9: MODERN GENETICS. SEX DETERMINATION Sex Chromosomes: Determine male or female Male: XY Female: XX

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