General Science GENETICS IBDP Biology Uncategorized 10.3 Gene pools and speciation May 26, 2021 Shveta 0 Comments Gene pools and speciation, Genetics, IBDP Biology 1.How do the concepts of gradualism and punctuated equilibrium differ?The timing of evolution The mechanism causing evolutionThe sequence of evolutionary events The reality of evolution 2. Which structure found in eukaryotes has a single membrane?Nucleus Lysosome Chloroplast Mitochondrion 3. What can lead to reproductive isolation after just one generation? Polyploidy Increased mutation rate Changed allele frequenciesIndependent assortment of chromosomes 4. The genetic determination of dogs’ coats can be quite complex, with many different genes acting at the same time. The dominant allele E gives brown tones. The recessive allele e results in red tones. • The colour intensity is due to another gene. The dominant allele B gives a dark colour, whereas the recessive allele b results in a light colour. What would be the genotype of a light brown dog produced from a cross between a dark brown dog and a light red dog?EEbb EeBb eeBb Eebb 5. The graph shows variations in beak size for the bird Geospiza fortis on an island in the Galápagos archipelago. What evidence from the graph indicates that disruptive selection is occurring? An intermediate beak size is less commonMedian beak size is the most commonSmaller beaks are favouredLarger beaks are favoured6. Fossil records show that black bears increased in size during the Ice Age and decreased in size with warmer temperatures. What type of selection do these changes in size represent? Allopatric Directional DisruptiveStabilizing