BIOL 133 WEEK 15 CHAPTER 19 – QUESTION AND ANSWERS

BIOL 133 Week 15 Chapter 19 What is the only way to introduce a new allele into a species? In South America, there is a specific type of frog where the male uses a loud call in order to attract females, even though this makes him more likely to be found by a predator. This is an example of The accumulation of mutations in a population over generations leads to If alleles that cause disease are constantly being selected against, why would there be any disease-causing alleles in a population over generations? The fact that being homozygous recessive for the CCR5 receptor protects people from being infected with HIV, thus causing an increase in the recessive CCR5 allele, is an example of Cheetahs, once hunted to near extinction, are now protected and recovering, although the number of different alleles at 5 different loci has dropped from 28 to 16. This is an example of ________. A group of birds migrate to a newly formed island and have a genetic makeup that is different from the original population. This is known as ________? Although Lamarck’s idea of inheritance of acquired characteristics was demonstrated to be false, there is a way in which exposure to some environmental factors can be passed on to offspring. This is known as Population bottlenecks and founder effects What does the term 2pq represent in the Hardy-Weinberg principle?