Origin of Species

Question 1

There are two groups of frogs that are extremely similar in appearance and live together in the same lake. What might prevent them from breeding?

Answer 1

Behavioural isolation, tenporal

Question 2

What are some limitations of the biological species concept?

Answer 2

Cannot be applied to preserved specimens, fossils, and asexual organisms; and it emphasizes absence of gene flow

Question 3

Why might grolar bears have reduced fitness compared to polar or grizzly bears?

Answer 3

Because they are not as well as adapted, are not specialized for the habitats.

Question 4

How does speciation occur?

Answer 4

Geographic isolation sets the stage, evolve independently (mutation, natural selection and drift), and reproductive isolation may result from this genetic divergence.

Question 5

What is polyploidy?

Answer 5

Unintentional doubling of chromosome number

Question 6

What is the difference between autopolyploids and allopolyploids?

Answer 6

Autopolyploids happen within the same species and allopolyploids happen between different species.

Question 7

Why is polyploid far more common in plants?

Answer 7

Because many can self-fertilize and many can reproduce asexually

Question 8

How do mole salamanders reproduce?

Answer 8

Asexually, by stealing spermatophores from diploid males of related species to trigger egg development