BIO 30_Exam 3_Lec 12 C

Which of the following are modes of selection

• stabilizing
• directional
• disruptive/diversifying
• linear
• non-directional

phenotypic extremes are eliminated; favored phenotypes (mean)

• stabilizing
• directional
• disruptive/diversifying
• linear
• non-directional

one extreme is favored

• stabilizing
• directional
• disruptive/diversifying
• linear
• non-directional

both extremes are selected for

• stabilizing
• directional
• disruptive/diversifying
• linear
• non-directional

Important factors to the recipient population during migration

• difference in gene frequencies of recipient population and migrant group
• proportion of migrant genes
• number of generations of migration
• area of habitat

random genetic drift

• random change in allelic frequency due to sampling error
• changes is in random direction and dependent on population size
• specific and selected changes in allelic frequency
• bidirectional change on small population size

Effect of random genetic drift

• homozygosity
• loss og genetic diversity
• heterozygosity
• increase of genetic diverity

Edffect of random genetic drift

• for small population, drift is significant
• for large population, drift is negligible
• for small population, drift is negligible
• for large population, drift is significant

small number of individuals migrate into new location and become new population, proposed by Mayr 1952

• founder effect
• backcross effect
• generational effect
• heritability effect