SI Session 4/16

Selection of Alleles

100

Mean population fitness ___ when you get rid of the less fit allele

increases

200

After many generations, less fit alleles would be expected to _____

Disappear

300

If a more fit recessive allele results in more homozygous recessives, frequency of the more fit recessive allele will ____

increase

400

Less fit dominant alleles are removed more ____ and ____

quickly, completely

500

Less fit recessive alleles may remain in the population at low levels because they can ____

hide

Other Selection

100

heterozygotes have higher fitness than either homozygote

overdominance or heterozygote advantage

200

False wanderer butterflies display ____

heterozygote disadvantage or underdominance

300

Heterozygotes have lower fitness than either homozygote

underdominance or heterozygote disadvantage

400

Trait for sickle cell anemia is an example of

heterozygote advantage

500

If selection varies spatially or temporally, ____ may be maintained

polymorphism