Non-random Mating, Population Structure, Migration And Wright’s F Statisitic

Question 1

Define random mating

Answer 1

• when mating takes place between individuals in the same proportions as their population genotype frequencies

Question 2

What is positive and negative assortative mating

Answer 2

Positive assortative mating -> occurs when individuals with similar genotypes of phenotypes mate preferentially (common in natural populations)

Negative assortative mating -> occurs when individuals with dissimilar genotypes or phenotypes mate preferentially (disassortative mating)

Question 3

Describe migration

Answer 3

• aka gene flow
• occurs when individuals move between populations
• if populations have different gene frequencies, migration may alter the gene frequencies in the recipient population or introduce new alleles
• tends to make populations genetically similar

Question 4

The Wahlund effect

Answer 4

• occurs when two populations are mixed
• also when two or more sub populations are present with little gene flow between them
• the observation that there are fewer heterozygous in the resulting mixed population is known as the wahlund effect