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Inheritance Patterns and Human Genetics

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Title: Inheritance Patterns and Human Genetics Author: Redlands East Valley High School Created Date: 11/30/2001 6:54:24 PM Document presentation format – PowerPoint PPT presentation

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Title: Inheritance Patterns and Human Genetics


1
Name Date Period
Chapter 14 Human Genetics
Cornell Style
Questions
Take notes here
Summary one summary at the end
2
Pedigree Analysis
Studying a family tree for detection of a trait
3
pedigree diagram
I
generations
II
1
2
3
birth order
4
pedigree symbols
male
affected individual
female
carrier
Carriers have one recessive allele and can
pass the trait without expressing it.
mating
(identical) twins
(fraternal) twins
5
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6
Sex-linked traits
  • Inherited through genes on the X (or Y)
    chromosome

7
Sex-linked traits
  • Example
  • Colorblindness the most common is red-green

8
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9
Sex-linked traits
  • Example
  • Hemophelia bleeders disease,
  • males 110,000, females 11,000,000

10
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11
  • Each human body cell has 46 chromosomes.
  • Sex chromosomes -- determine the sex of an
    organism.
  • Humans have 2 sex chromosomes
  • X X female X Y male
  • Autosomes -- all of the other chromosomes
  • Humans have 44

12
  • Humans have 2 types of cells sex and body.
  • Sex cells are called haploid cells (n). They have
    23 chromosomes. They are sperm in males and eggs
    in females.
  • Body cells are called Diploid cells (2n). They
    have 46 chromosomes, 23 from each parent. They
    make your body.

13
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14
Prenatal Diagnosis
  • Amniocentesis small amount of fluid is removed
    from the sac around the embryo
  • A karyotype is then done to ID all the
    chromosomes in the nucleus

15
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16
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