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11.1 bgy

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Amber Dowdy

on 4 November 2011

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Transcript of 11.1 bgy

Basic Patterns of Human Inhertiance
carrier: heterozygous for a recessive disorder
Cc: carrier for CF
CC: would NOT carry the gene
Recessive disorders:
cystic fibrosis: excessive mucus, digestive & respiratory failures, no cure
must clean mucus from lungs daily
albinism: no color in hair,
skin or eyes
tay-sachs: abscence of enzyme that breaks down fat, fat builds up on
brain, death by age 5
Dominant Recessive Disorder: People who do not have the disorder and are homozygous for the trait
huntington's: affects the neurological functions,
decline of mental health, no cure or treatment
achondroplasia: short arms & legs
large head, gene affects bone growth
is abnormal...no cure/treatment
pedigrees: diagram that traces the inheritance
of a trait through several generations
males: squares
females: circles
One who expressed the trait is filled or dark,
one who does not is empty
horizontal lines represent the parents of the offspring
Roman numerals represent the generation, the birth order is shown by Arabic numerals
polydactyly: extra fingres & toes, dominant genetic disorder
predicting disorders: if good, detailed records are kept, predicting disorders becomes much easier. (ex: family history @ dr.)
11.2 Complex Patterns of Inheritance
incomplete dominance: heterozygous phenotype
is an intermediate phenotype between the 2 homozygous
ex: red flower mixed with white = pink
codominance: both alleles are expressed in heterozygous condition example: sickle cell anemia
affects blacks, blood cells are not rounded, but a "c" shape
can't transport oxygen efficiently
blood groups are determined by multiple alleles:
sex determination: sex chromosomes determine gender of baby
xx= female
xy= male
the other 22 are known as
the x chromosome is larger than the y.
In females, one x stops working, this is known
as dosage compensation.
The y chromosome is responsible for male characteristics
polygenic traits: interactions of multiple pairs of genes
to determine skin type, height, eye color, finger print pattern
Things that influence environmental phenotypes:
1. diet
2. exercise
3. life style

identical twins are genetically the same .
If a trait is inherited, the will BOTH have it
Full transcript