QUESTION 1 A dam dividing a fish population will likely lead to sympatric specia

Question

QUESTION 1

A dam dividing a fish population will likely lead to sympatric speciation.

True

False

10 points   

QUESTION 2

As certain lineages of animals evolved more and more complex body plans, what has happened to the Hox genes of these animals?

The number of Hox genes has been reduced

The more complex the body plan, the greater the number of Hox genes.

Complex body plans have more inactive Hox genes

There is no correlation between body plan complexity and Hox genes

10 points   

QUESTION 3

Which of the following would lead to allopatric speciation?

the colonization of an island by a subset of the mainland population

a new river channel dividing beetles into two separate populations

the extinction of a large proportion of a population, leaving only distant sub-populations

all of the above

10 points   

QUESTION 4

The hybrid sterility of a hinny (cross between a female horse and a male donkey) is an example of

prezygotic isolation

allopatric speciation

sympatric speciation

postzygotic isolation

The number of Hox genes has been reduced

The more complex the body plan, the greater the number of Hox genes.

Complex body plans have more inactive Hox genes

There is no correlation between body plan complexity and Hox genes

Explanation / Answer

Question 1 - False

Sympatric speciation leads evolution of new species when something inhibiting the same geographic region.Allotrophic variation is just same as sympatric apeciation but it involve physical barrier and here Dam is a physical barrier.

Question 2 - The correct answer is The more complex the body plan, the greater the number of Hox genes.

The Hox gene controlled the body plan. it is very clear that improvement or complexity of any character i.e. body plan either it is through envioronmental factoror genetic leads to the complexity of gene.

Question 3 - all of the above

Allopatric speciation occurs when a single species get isolated.

Question 4- The correct answer is postzygotic isolation.

Post zygotic isolation prevents the formation of fertile offspring include hybrid sterility, hybrid breakdown.

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