NATURAL SELECTION EXAM QUESTIONS

Question 1

Describe how thinner beak of species A is a result of evolution

Answer 1

• Mutations occurred that changed the shape of the beak(1)
• thinner beaks are more suited to catching food(1)
• birds with thinner beaks were more successful(1)
• more birds with thinner beaks reproduce and passed on alleles for thinner beaks(1)
• this occurs over many generations(1)

Question 2

Explain how these bacteria have become resistant to coliston(1)

Answer 2

people do not finish their course(1)

natural selection occurs(1)

some bacteria have a mutation(1)

these resistant bacteria survive and reproduce(1)

Question 3

Describe the theory of natural selection(3)

Answer 3

overproduction of offsprings(1)

organisim in species have a mutation(1)

there is a struggle for existence pressure(1)

the adapted organisims survive(1)

offspring inheriting allele(1)

this is repeated over many generations(1)

Question 4

Explain how MRSA bacteria have evolved to become resistant to antibiotics(6)

Answer 4

bacteria reproduce rapidly generally a large population(1)

there is variation among bacterial population(1)

some bacteria devlop resistance to antibiotics do not survive(1)

levels of antibiotics do not survive,levels of antibiotic resistance in a population of bacteria increase

Question 5

Explain how natural selection could have caused an increase in beak length because of the use of bird feeders.(2)

Answer 5

bird feeders provide a selection pressure(1)

these birds are most likely to survive pass the allele(1)

over many generations the beak length of population increases(1)

Question 6

Describe how these type of genetic analysis provide evidence for evolution(2)

Answer 6

compare the genes(1)

closely related organism have more similar sequence(1)