nisms be able to produce to count as the same species?","back":"Fertile offspring.","points":1},{"id":"f018ffa8-6bcb-4943-826b-323c61c5a5be","cardType":"cloze","front":"A gene pool is [ ] in a [ ] at a particular time.","back":"A gene pool is all the alleles of all genes in a population at a particular time.","points":null},{"id":"43dd3fd3-cfc0-4cc7-b48e-0b893b78140d","cardType":"cloze","front":"An organism’s phenotype is affected by [ ] and the [ ].","back":"An organism’s phenotype is affected by genotype and the environment.","points":null},{"id":"2bb3a2bd-c20c-44e8-994a-05bb75648488","cardType":"cloze","front":"[ ] creates new alleles; meiosis and random fertilisation mainly create [ ].","back":"Mutation creates new alleles; meiosis and random fertilisation mainly create new combinations of existing alleles.","points":null},{"id":"b57b9242-30a9-4176-8dfe-640de0d8d778","cardType":"cloze","front":"Natural selection involves differential [ ] and [ ].","back":"Natural selection involves differential survival and reproduction.","points":null},{"id":"b3f53910-3064-409a-be6b-0b9207f98ad4","cardType":"basic","front":"Why do darker moths survive better on polluted, dark tree bark?","back":"

Camouflaged on dark bark.
Less visible to birds, so less predation.

","points":2},{"id":"e8e82dec-ab7d-4e1f-90ed-940b57d5bf83","cardType":"basic","front":"What happens to favourable alleles over generations under natural selection?","back":"Their frequency increases in the gene pool.","points":1},{"id":"27375def-9809-48c4-a08c-2aa3ff6e3efa","cardType":"basic","front":"Why is it incorrect to say an individual evolves?","back":"Evolution is allele frequency change in a population over generations.","points":2},{"id":"a5a432c4-9bbb-4609-a006-88be6411d966","cardType":"basic","front":"For BB, Bb and bb genotypes, what is the frequency of allele B?","back":"$$p_B=\\frac{2n_{BB}+n_{Bb}}{2N}$","points":1},{"id":"f133d625-0f16-499d-b253-6fb9d02b2745","cardType":"basic","front":"100 beetles: 36 BB, 48 Bb, 16 bb. What is allele B frequency?","back":"$$p_B=\\frac{120}{200}=0.60$","points":2},{"id":"ac557340-1ab8-4206-839f-44415bf4a55b","cardType":"cloze","front":"[ ] favours intermediate phenotypes; [ ] favours one extreme phenotype.","back":"Stabilising selection favours intermediate phenotypes; directional selection favours one extreme phenotype.","points":null},{"id":"6fa89295-c5a1-4e19-a388-0b36ab5f8753","cardType":"basic","front":"What happens to variation under stabilising selection?","back":"

Variation decreases.
Mean phenotype stays similar.

","points":2},{"id":"240bffce-b2b2-4233-8288-8b397448db45","cardType":"basic","front":"A drought favours birds with larger beaks and mean beak depth rises. What selection type is this?","back":"Directional selection.","points":1},{"id":"4bc6d81d-7617-477d-8152-4d77912c3c98","cardType":"cloze","front":"[ ] favours both extremes and selects against [ ].","back":"Disruptive selection favours both extremes and selects against intermediate phenotypes.","points":null},{"id":"00ba491a-eb17-494d-b9af-b507dc4dd92a","cardType":"basic","front":"What must happen for disruptive selection to contribute to speciation?","back":"Extreme groups becom

Evolution may lead to speciation (A-level only) Flashcards

Evolution may lead to speciation (A-level only) Flashcards

Evolution may lead to speciation (A-level only) Flashcards

Evolution may lead to speciation (A-level only) Flashcards