BIOL239 Lecture Notes - Lecture 4: Color Blindness, Y Chromosome, Chromosome
26 Jan 2018
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Document Summary
Sex-limited traits: affects a structure or process that is found in one sex but not the other (male animals having bigger horns than females; milk production) Sex-influenced traits: show up in both sexes but their expression may differ between the two sexes (patterned baldness) Environment: factors such as temperature, light, and altitude can affect the phenotypic expression of a genotype. Conditional lethality: occurs with a particular type of allele which is lethal only under certain conditions. It is a genetic disease triggered by certain anesthetics which results in uncontrolled muscle contractions and high fever and death if not treated. Autosomal trait: one that is conferred by a gene residing on a chromosome that is not involved in sex determination. The human genome consists of 46 chromosomes, 22 pairs of autosomes and 1 pair of sex chromosomes (the x and y chromosome) In humans, presence of y chromosome determines maleness: in drosophila it does not.
