Question

1)If, someday, an archaean cell is discovered whose rRNA sequence is more similar to that of humans than the sequence of mouse rRNA is to that of humans, the best explanation for this apparent discrepancy would be _____.
A) homology
B) homoplasy
C) common ancestry
D) retro-evolution by humans

2)Which of the following is an example of homoplasy?

A) cell walls in plants and fungi
B) chlorophyll in flowering plants and algae
C) fur in bears and seals
D) scales in snakes and lizards

3.Natural selection____.

A)creates beneficial mutations

B)is a random process

C) completely eliminates harmful mutations

D)can favor beneficial mutations

Answer 1

Answer 1. Homoplasy

A homoplasy is a character shared but not present in their common ancestor by a set of species. The evolution of the eye that has originated independently in many different species is a good example. When this happens a convergence is sometimes called.

Answer 2. Cell wall in plants and fungi

Cell walls and fungi in plants. -The cell walls of the plant are made of cellulose, and the chitin fungal cell walls.

Answer 3. Can favor beneficial mutations

Once any beneficial mutations occur, natural selection favors their spread. If this picture is right, then this means that at the heart of evolution there are opposing forces. There's no question that complex structures and actions such as eyes and language are the result of natural selection.