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Human Genetics and Pedigrees

Learn about human genetics, pedigrees, and chromosome mapping through a combination of methods and principles. Understand how sex-linked traits and disorders are inherited in families. Explore karyotypes and chromosomal changes.

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Human Genetics and Pedigrees

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  1. Human Genetics and Pedigrees Chapter 7.4

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

  3. Human Genetics & Pedigrees • http://www.youtube.com/watch?v=ZL1T5IzhgtI • 11mins

  4. 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.

  5. Y X Females can carry sex-linked genetic disorders. • Males (XY) express all of their sex linked genes. • Expression of the disorder depends on which parent carries the allele and the sex of the child.

  6. 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.

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

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

  9. 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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