BLG 144 MIDTERM 1 FINAL PAPER 2026
COMPLETE QUESTIONS WITH SOLUTIONS
GUARANTEED TO PASS
◉ genetic variation. Answer: # and relative frequency of alleles
present in particular population
-lack of genetic variation is usually a bad thing
◉ types of selection. Answer: -directional
-stabilizing
-purifying
-disruptive
-balancing
-frequency-dependent
◉ directional selection. Answer: when average phenotype of
population has changed in ONE DIRECTION
-tends to reduce genetic diversity
◉ purifying selection. Answer: when deleterious or harmful alleles
are removed from population
, ◉ stabilizing selection. Answer: no change in average trait value
overtime and genetic variation in populations is reduced
(favors average trait value and reduces extreme traits)
◉ disruptive selection. Answer: extreme traits are favored and
eliminates the average phenotypes
-crucial since sometimes play a part in formation of new species
◉ balancing selection. Answer: no single allele has a distinct
advantage and increases in frequency
-neutral in terms of fitness and frequency
◉ heterozygous advangtage. Answer: heterozygous individuals hae
higher fitness than homozygous (sometimes)
◉ genetic drift. Answer: any change in alele frequencies due to
change
-random with respect to fitness
-happens often in small population
-increased genetic differences between populations
◉ frequent-dependent selection. Answer: certain alleles are
favoured when rare, not when common
COMPLETE QUESTIONS WITH SOLUTIONS
GUARANTEED TO PASS
◉ genetic variation. Answer: # and relative frequency of alleles
present in particular population
-lack of genetic variation is usually a bad thing
◉ types of selection. Answer: -directional
-stabilizing
-purifying
-disruptive
-balancing
-frequency-dependent
◉ directional selection. Answer: when average phenotype of
population has changed in ONE DIRECTION
-tends to reduce genetic diversity
◉ purifying selection. Answer: when deleterious or harmful alleles
are removed from population
, ◉ stabilizing selection. Answer: no change in average trait value
overtime and genetic variation in populations is reduced
(favors average trait value and reduces extreme traits)
◉ disruptive selection. Answer: extreme traits are favored and
eliminates the average phenotypes
-crucial since sometimes play a part in formation of new species
◉ balancing selection. Answer: no single allele has a distinct
advantage and increases in frequency
-neutral in terms of fitness and frequency
◉ heterozygous advangtage. Answer: heterozygous individuals hae
higher fitness than homozygous (sometimes)
◉ genetic drift. Answer: any change in alele frequencies due to
change
-random with respect to fitness
-happens often in small population
-increased genetic differences between populations
◉ frequent-dependent selection. Answer: certain alleles are
favoured when rare, not when common
