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

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 are the same in all sexually reproducing organisms. Inheritance of many human traits is complex. Single-gene traits are important in understanding human genetics.

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

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.

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

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

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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