KEY CONCEPT A combination of methods is used to study human genetics. - PowerPoint PPT Presentation

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KEY CONCEPT A combination of methods is used to study human genetics.

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KEY CONCEPT A combination of methods is used to study human genetics. Human genetics follows the patterns seen in other organisms. The basic principles of genetics ... – PowerPoint PPT presentation

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Title: KEY CONCEPT A combination of methods is used to study human genetics.


1
KEY CONCEPT A combination of methods is used to
study human genetics.
2
Human genetics follows the patterns seen in other
organisms.
  • The basic principles of genetics are the same in
    all sexually reproducing organisms.
  • Inheritance of many humantraits is complex.
  • Single-gene traits areimportant in
    understandinghuman genetics.

3
Females can carry sex-linked genetic disorders.
  • Males
  • XY
  • Disorders show up for frequently b/c need just
    one X
  • Females
  • -XX
  • -Takes both recessive alleles for a female
  • to inherit.

4
A pedigree is a chart for tracing genes in a
family.
  • Phenotypes are used to infer genotypes on a
    pedigree.
  • Autosomal genes show different patterns on a
    pedigree than sex-linked genes.

5
  • If the phenotype is more common in males, the
    gene is likely sex-linked.

6
Several methods help map human chromosomes.
  • A karyotype is a picture of all chromosomes in a
    cell.

7
  • Karyotypes can show changes in chromosomes.
  • deletion of part of a chromosome or loss of a
    chromosome
  • large changes in chromosomes
  • extra chromosomes or duplication of part of a
    chromosome
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