20.6 Speciation And Aryficial Selection

Question 1

How does speciation occur

Answer 1

Members become isolated and no longer interbreed
They Continue to undergo random mutations and different characteristics are selected for and against because of different selection pressures
This leads to changes in the phenotypes

Question 2

What is allopatric speciation

Answer 2

Happens when members of a population are seperated from the rest of the group by a physical barrier

Question 3

What is sympatric speciation

Answer 3

Occurs in populations that share the same hapbitat
More common in plants
Members of 2 different interbreed and from fertile offspring

Question 4

What is polymorphic

Answer 4

Display more than 1 distinct phenotype

Question 5

What problems are caused by inbreeding

Answer 5

Many genetic disorders are caused by recessive alleles and organisms closely related are genetically similar so if they breed there is a greater chance the offspring will be homozygous and get the genetic disorders