bio notes3

bio notes3 - Autosomal recessive Generations often skipped...

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Autosomal recessive Generations often skipped Almost equal distributions among sexes If both parents are affected, all children should be affected Most affected have normal parents Autosomal dominant Generations are not skipped Almost equal distributions among sexes Sex linked recessives (X chromosome) Most affected are male Affected males result from carrier (heterozygote) mothers who are known by having affected brothers, fathers, or maternal uncles Approximately half the sons of carrier females should be affected Abnormalities in chromosome number In plants, it can be tolerated Wheat- hexaploid (6n) Bananas- triploid (3n) Bananas we eat… 1950’s-gros Michel Today- Cavendish Most lethal-animals are sensitive to gene dosage Viable defects often involve the sex chromosomes-dosage compensation due to inactivation of the X chromosome Due to errors in meiosis: nondisjunction Chromosomal abnormalities Polyploidy-multiples of the haploid set (more than 2n) Triploidy- 75% due to males 69XXY
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bio notes3 - Autosomal recessive Generations often skipped...

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