62 Tema 12 Caracteres Cualitativos en Poblaciones. Genética (Cód. 2030)

This educational video, part of a genetics course, solves four problems related to qualitative characters in populations. Problem 4 involves a sample of 900 cattle where 891 have white wool and 9 have black wool, with white dominant. Assuming Hardy-Weinberg equilibrium, the instructor calculates allele frequencies (p=0.9, q=0.1) and genotype frequencies (p^2=0.81, 2pq=0.18, q^2=0.01). Problem 5 examines a population of 1000 rabbits with 40 recessive long-haired individuals. Using family data from crosses (short x short and short x long), the instructor calculates expected frequencies and performs chi-square tests to determine if the population is in equilibrium. Problem 6 deals with a gene with three codominant alleles (PA, PB, PC) in a sample of 400 Brazilians, calculating allele frequencies and expected genotype frequencies under equilibrium. Problem 7 involves multiple alleles with a dominance hierarchy in rabbit coat color, deriving formulas for allele frequencies based on phenotype frequencies and applying them to a sample of 200 rabbits. The video emphasizes the importance of assuming equilibrium and using family data when dominance is complete.