PSYC2010 Lecture Notes - Lecture 5: Asthma, Malabsorption, Cystic Fibrosis

• School: Memorial University
• Department: Psychology
• Course: PSYC2010
• Professor: Michele Mercer

Document Summary

Forms of the same gene on a pair of chromosomes: appear at the same place on each chromosome in the pair, one allele is inherited from each parent. Homozygous: the two alleles are the same. Only 1 allele affects the trait dominant. If d allele is present, effect will be expressed. If d allele is present, effect will be expressed only if another d is present. Example: dimples (dominant trait, let d represent dominant allele (dimples, let d represent recessive allele (no dimples, 3 possible combos, dd = homozygous dominant (dimples, dd = heterozygous (dimples, dd = homozygous recessive (no dimples) Punnett square diagram used to predict the probability of an offspring having a particular genotype. Some dominant and recessive characteristics: dominant, dark hair, curly hair, facial dimples, normal vision, normal hair, type a blood, type b blood, recessive, blonde hair, straight hair, no dimples, nearsightedness, pattern baldness, type o blood. Both alleles contribute in a blended form.