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Transcript
Recessive Genetic Disorders Do you remember…? • True or False : • A) The father determine a childs gender • B) individuals may transmit characteristics to their offspring which they themselves do not show • C) identical twins are of the same gender • A recessive trait is expressed when the individual is homozygous recessive for that trait. • *Recall: what does it mean to be homozygous recessive for a trait? (think pair share) • An individual who is heterozygous for a recessive disorder is called a carrier. Cystic Fibrosis • One of the most common recessive genetic disorders • The gene that codes for a membrane protein is defective • Causes excessive mucus production and digestive and respiratory failure • There is no cure, must have a daily cleaning of mucus form lungs Albinism • This is caused by altered genes, resulting in the absence of the skin pigment melanin in hair and eyes. • Genes do not produce normal amounts of the pigment melanin • Results: no color in the skin, eyes and hair. • Skin is susceptible to UV damage • Vision problems • There is no cure, must protect skin form the sun, need visual rehabilitation Tay-sachs disease • Read in your textbook with a partner the additional two recessive disorders and we will fill in these as a class.
