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Download sex-linked traits: traits controlled by genes located on thr sex
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Transcript
SEX-LINKED TRAITS: TRAITS CONTROLLED BY GENES LOCATED ON THR SEX CHROMOSOMES. X = FEMALE SEX CHROMOSOME Y = MALE SEX CHROMOSOME (SMALLER THAN X AND DOES NOT CONTAIN AS MANY GENES) Objectives: 1) Define through example sex-linked traits and polygenic inheritance. 2) Identify other factors that might control gene expression. http://www.glennalicious.org/archives/blood-cells-2.jpg THOMAS HUNT MORGAN DISCOVERED TRAITS LINKED TO SEX CHROMOSOMES. HE FIRST NOTICED THIS IN FRUIT FLY EYE COLOR. MORGAN’S 1ST EXPERIMENT: X FEMALE Xr Y XR XRXr XRY XR XRXr XRY MALE OFFSPRING: ALL RED EYES POLYGENIC INHERITANCE: TRAIT CONTROLLED BY MORE THAN ONE GENE. EXAMPLE: HUMAN HEIGHT WHICH IS CONTROLLED BY 5 GENES. EACH GENE HAS 2 ALLELES. THE MORE CAPITAL (DOMINANT) ALLELES A PERSON HAS, THE TALLER THEY WILL BE. EXTERNAL ENVIRONMENTAL FACTORS, SUCH AS LIGHT, CAN DETERMINE HOW SOME GENES ARE EXPRESSED, IF AT ALL. INTERNAL ENVIRONMENTAL FACTORS (HORMONES) CAN CONTROL HOW CERTAIN GENES ARE EXPRESSED. EXAMPLES OF SUCH GENES ARE HOSE THAT DETERMINE HORN SIZE IN MOUNTAIN SHEEP, MALE PATTERN BALDNESS, AND FEATHER COLOR IN PEACOCKS 1
