3.4.4 Genetic diversity and adaptation

Question 1

What is genetic diversity and what it lead to?

Answer 1

the number of different alleles of genes in a population
a factor enabling natural selection

Question 2

Natural selection

Answer 2

• variation in a population due to random mutation in genes producing new alleles
• selection pressure due to competition with source like food , mate, water
• advantageous alleles will pass on as they survive (survive of the fittest)
• survival species reproduce and pass on advantage alleles so the frequency of the advantageous alleles increased in the population
• so the species is better adapted to the environment

Question 3

two type of variation and their graph and example

Answer 3

continuous
normal distribution
height/ weight/ finger length
controlled by a lot of gene and environment

discountinuous
bar graph
tougues rolling/ finger print/ eye color
controlled by a few genes

Question 4

3 types of selection with example and description

Answer 4

Directional (extreme) - antibiotic resistant
Stablizing (moderate- keep average the same) - baby size
disruptive (both extreme) - color of oyster shell black and white not grey, help survive in and deep or shallow area- hide)