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