Inheritance

Question 1

Modern humans have less body hair than their ancestors. Explain how this evolutionary change was brought up by natural selection. (4)

Answer 1

There decrease in body hair of modern humans has been brought by how there was a variation in the amount of body hair (1)which was caused by mutation.(1) This is because less hair increased heat loss in warm climates or things that aid humans’ survival such as hunting for food.(1) This leads to more individuals surviving and reproducing.(1) As a result, their offspring will be passed on the genes which will help them adapt to the environment with less hair. (1)

Question 2

Define the term allele (1)

Answer 2

An allele are two versions of a gene (1)

Question 3

Give the term used to describe a trait that is determined by multiple genes (1)

Answer 3

Polygenic (1)

Question 4

state why is mitosis important in multicellular organisms (1)

Answer 4

Its important because it allows growth and repair of the damaged tissues (1)

Question 5

Use the theory of evolution by natural selection to explain how H.pylori bacteria could have evolved to produce urease (4)

Answer 5

The H.pylori mutates first which mutated (1)which caused a new allele(1) into the species where only certain cells could’ve survived.(1) The ones who survived(1) were the only ones there who were able to reproduce(1) and pass on their alleles onto their offspring (1)