Question

31. Which of the following is an example of pre-zygotic reproductive isolation?

Select one:

a. Hybrid sterility

b. Hybrid inviability

c. Hybrid breakdown

d. Mechanical isolation

33. Which of the following examples from �Macroevolution Animation� demonstrate(s) the explosive diversification that often occurs after the development of a new adaptation and/or after previously unavailable habitats and niches become available?

Select one:

a. Flowering plants

b. Wings

c. Mammals

d. All of the above

e. None of the above

34. When multiple new habitats open and there�s little competition within the new habitats, _____________________________________often occurs as populations move into the new areas, resulting in development of many different species from one common ancestor.

Select one:

a. adaptive cycling

b. adaptive radiation

c. maladaptive radiation

d. fortuitous encounters

e. close encounters of the third kind

35. The males of each species of fiddler crab have their own pattern of waving their large front claws to attract females. Females of a different species will not be attracted to the wave of a different species. This is an example of

Select one:

a. temporal isolation.

b. habitat isolation.

c. physical isolation.

d. infertility.

e. behavioral isolation.

Answer 1

Dear Student answer of your question is given below:

Solution of Q 31: D option is correct answer.

Mechanical isolation is prezygotic as morphological difference leads to prevent hybridization and hence more speciation and differentiation occurs. Eg snail shell coiling. Rest three options are postzygotic isolations.

Solution of Q 33: d option is correct answer.

Macro evolution occurs in all above examples be it flowering plants , mammals, or wings of birds.

Solution of Q 34: option B is correct answer.

Adaptive radiation is defined as process in which organisms diversify themselves from a common ancestor.

Solution of Q 35: option E is correct answer.

Behaviour isolation is occurs when organisms show different behaviour which is not preferred by the same memeber of soecies. E.g is during mating calls.