bio

Rank the following from most general to most specific: 1. gametic isolation 2. reproductive isolating mechanism 3. sperm-egg incompatibility 4. prezygotic isolating mechanism A) 2, 3, 1, 4 B) 2, 4, 1, 3 C) 4, 1, 2, 3 D) 4, 2, 1, 3 E) 2, 1, 4, 3

2, 4, 1, 3

Macroevolution

Evolutionary change above the species level.

gametic isolation

Sperm of one species may not be able to fertilize eggs of another species

hybrid zone

a region in which members of different species mate and produce hybrids

Three populations of crickets look very similar, but the males have courtship songs that sound different. What function would this difference in song likely serve if the populations came in contact?

behavioral isolation

Dogs (Canis lupus familiaris) and gray wolves (Canis lupus) can interbreed to produce viable, fertile offspring. These species shared a common ancestor recently (in geologic time) and have a high degree of genetic similarity, although their anatomies vary widely. Judging from this evidence, which two species concepts are most likely to place dogs and wolves together into a single species?

biological and fiological

Dog breeders maintain the purity of breeds by keeping dogs of different breeds apart when they are fertile. This kind of isolation is most similar to which of the following reproductive isolating mechanisms?

habitat isolation

when is fusion most likely to occur

increase in hybrids

in which order do the following occur during allopatric speciation: Genetic drift, genetic isolation, divergence

isolation, drift, divergence

how many genes influence the formation of new species

one or many

Most causes of speciation are relatively slow, in that they may take many generations to see changes, with the exception of _____.

polyploidy

Two species of frogs belonging to the same genus occasionally mate, but the embryos stop developing after a day then die. Is this prezygotic or postzygotic reproductive barrier? Which type?

postzygotic reduced hybrid viability

Mules are sterile hybrids. Which postzygotic reproductive barrier is this an example of?

reduced hybrid fertility

when is reinforcement most likely to occur?

reproduction is weak decrease in hybrids

what is the largest unit within which gene flow can readily occur?

species

Beetle pollinators of a particular plant are attracted to its flowers' bright orange color. The beetles not only pollinate the flowers, but they mate while inside of the flowers. A mutant version of the plant with red flowers becomes more common with the passage of time. A particular variant of the beetle prefers the red flowers to the orange flowers. Over time, these two beetle variants diverge from each other to such an extent that interbreeding is no longer possible. What kind of speciation has occurred in this example, and what has driven it?

sympatric, habitat differentiation