Inheritance Patterns and Human Genetics

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Name Date Period
Chapter 14 Human Genetics
Cornell Style
Questions
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Summary one summary at the end
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Pedigree Analysis
Studying a family tree for detection of a trait
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pedigree diagram
I
generations
II
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2
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birth order
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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
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Sex-linked traits

• Inherited through genes on the X (or Y)
  chromosome

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Sex-linked traits

• Example
• Colorblindness the most common is red-green

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Sex-linked traits

• Example
• Hemophelia bleeders disease,
• males 110,000, females 11,000,000

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• 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

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• 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.

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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

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