Evolution Answers

What is the MOST likely reason that many homeotic gene sequences are very, very similar even in species that do not share a recent common ancestor?

Alligators, dinosaurs, mammals, and birds are all more closely related to one another than any of these species are to turtles, according to the evidence. If we want taxonomic classes to represent ancestral relationships - with all members of a group sharing a shared ancestor and the group containing all descendants of that common ancestor - how do we revise vertebrate classification?

2.Why isn't there a single body system that is absolutely essential for the human species survival? Your answer must be well-reasoned

E.coli has become resistant to antibiotic have killed and sickened many.Is this an example of evolution?why or why not?

The acoustic lesser wax moth, Achroia grisella, are obligate symbiotes of honeybees (live in association with them).  Males attract females by emitting ultrasonic pulses from their wings. The sound the moth emits can also attract their predators, bats. Wing pulse rate has been demonstrated to be controlled by one gene with two alleles, F (dominant, fast) and f (recessive, slow).  

This population is not currently in Hardy-Weinberg equilibrium, but scientists have determined that environment and other selection factors such as bat predation are stable over recent time. In paragraph form, discuss two other mechanisms of evolution that could be acting on this population, and what information and/or data you would need to support each evolutionary agent. You will be marked according to the written answer rubric on your answer, use of scientific reasoning, and avoiding misconceptions. (5 points) You should have a maximum of 6 sentences.

A population of garter snakes is being studied in the US, where the garter snakes have a variable level of resistance to neurotoxin produced by one of their prey animals, the newt. Neurotoxin resistance in these snakes is controlled by one gene, with two alleles, R (dominant, resistant) and r (recessive, not resistant). Previously, the scientists had obtained a frequency for the R allele of 0.25. During a survey several years after newts arrived, they surveyed 1000 animals, and 745 had resistance to the neurotoxin of those sampled. You should do a chi-square statistical analysis to compare the number of alleles over time, assuming the population is in Hardy-Weinberg at the time of the survey (you may want to know that the critical value for 2 is 3.841 for 1 degree of freedom at ɑ=0.05). Do you think that there is evidence that evolution is occurring? Support your answer using your statistics referencing the number of alleles. Include calculated allele frequencies and chi-square results for part marks. (5 marks)

A dwindling population of 1000 frogs occupies an isolated area in Costa Rica. To help preserve the species, scientists caught 20 frogs to start a new population in a nearby area. This species has a gene that affects eye shape. The 1000-member wild population has two alleles for this gene: R and r, with frequencies 0.7 and 0.3, respectively. What will be the allele frequencies of R and r in the 20-member founder population?

How did onions evolved through domestications throughout the years? Correct timeline

Are all species related?

How might you explain the existence of species that look so different from the others that it is obvious they do not share a very recent common ancestor?