- The connection of the yolk sac to the embryo diminishes during folding until it is the narrow, endoderm-lined vitelline duct, which is located at the umbilicus and opens into the ileum and the yolk sac
- The yolk sac is a large, endoderm-lined cavity lying ventral to the developing embryo
- Based on naïve assumptions, we might expect that optimal life history would be to never die and to produce an infinite number of offspring. Why can such a life history never evolve?
- The data on a prezygotic isolation below were taken from the study we discussed in class that concluded that species tended to evolve complete reproduction isolation after 1 million years of seperation (or 1 unit of genetic distance,D). Which of the following is a valid conclusion based on these data?
- Which amino acids are modified by Methylation?
- Sexual Selection tends to be strongest in ----- mating systems, which tend to have the highest -----?
- In a completely monogamous species where males and females have equal variance in reproductive success, the trivers - Willard hypothesis would predict that females in better condition should produce:
- In addition to ecological differences that lead to the disruptive selection, that factor is crucial in order for sympatric speciation to occur?
- Populations of snails with higher parasite prevalence also tend to have more males. What does this pattern suggeswt?
- The following graphs show data on lifetime mating success in wattled jacanas. Based on what you know about this species, which graph plots data from females?
- In an experiment by reznick and colleague, guppies that were placed in a lower predation streams evolved later reproduction an produced fewer, larger offspring. This illustrates that:
- Which of the following does not represent a possible direct benefit of mate choice?
- Chimpanzees have larger testes for their body weight than gorillas. What is the best explanation for the pattern?
- Hamiltons rule for the evolution of altruism states that altruism may increase in a population when:
- In a species, if beetle with an intense male-male competition before mating, which of these sexually selected traits would be most likely to evolve?
- Female sticklebacks prefer males with brighter red coloration on their belly. Given the results depicted in the graph below, it appears that females that choose redder males benefit from:
- An experiment showed that flycatchers are more likely to help their neighbors mob a potential predator when?
- Which amino acids are modified by Acetylation?
- Which types of species interaction often leads to the addition of new species, which increases the benefit ( and decreases the cost) for other species involved.
- Imagine an interaction between an insect and a plant. The insect eats the plant's pollen but manages to transfer some of it to other flowers in the population. How would you classify this interaction?