Human Heredity. A karyotype is a picture of chromosomes Of the 46 human chromosomes, they are arranged in 23 pairs 22 of the pairs are called body chromosomes.

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Presentation transcript:

Human Heredity

A karyotype is a picture of chromosomes Of the 46 human chromosomes, they are arranged in 23 pairs 22 of the pairs are called body chromosomes (called autosomes) One of the pairs are the sex chromosomes (x and/or y)

A pedigree chart can be used to represent heredity in a family

Dominant Disorders Huntington's

Codominant Disorders Sickle Cell

Recessive Disorders Albinism Cystic fibrosis – chromosome 7 recessive allele PKU (phenylketonuria) Tay-Sachs

Down Syndrome Person has an extra copy of chromosome 21 (3 copies)

Blood Typing Blood type is controlled by a single gene with three alleles

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