Topic 3

Question 1

number of chromosomes in domesticated animals

Answer 1

may change(assumption)
different no of chromosomes for different habitat
--> cross domesticated with wild =intermediate no

Question 2

mtDNA

Answer 2

mitochondrial DNA
stable and nearly constant sequences during development - mutations every approx 2000 yrs
= EVIDENCE FOR MICROEVOLUTION
(evidence for the population origin and migration processes)

Question 3

haldanes rule

Answer 3

if in a species hybrid only one sex is inviable or sterile, that sex is more likely to be the heterogametic sex. The heterogametic sex is the one with two different sex chromosomes; in therian mammals, for example, this is the male in mammals

Question 4

genetic pollution

Answer 4

uncontrolled gene flow into wild population (contaminated genes into wild animals)

impact on the fitness of a population, such as through outbreeding depression and the introduction of unwanted phenotypes which can lead to extinction.