Topic 3 Biology

Question 1

Ehat are advantages of sexual reproduction

Answer 1

Causes variation - if environment changes some of the species may have a variation that allows them to survive

Question 2

What are the advantages of sexual reproduction (artificial selection)

Answer 2

It allows us to do sexual breeding by using desirable characteristics can be breed and produce offspring

Question 3

Advantages of asexual reproduction

Answer 3

Only one parent is needed

Faster and use less energy - no need to find a mate

Question 4

What is the formation of meiosis

Answer 4

A cell divides into 2 and then 2 again with each cell having 23 chromosomes

These are gametes

Question 5

What is the structure of dna

Answer 5

Made of of nucleotides

Each nucleotide has one sugar molecule and one phosphate molecule (backbone)

A-g t-c

Double helix shape

Question 6

What are rhe 3 ways mutations change the bases in dna

Answer 6

A base is deleted

A base is a inserted

A bses is substituted

Question 7

What is environmental variation

Answer 7

Variation due to one’s environment which causes changes in their physical state - a child who does not eat properly won’t grow to full size

Question 8

What is genetic variation

Answer 8

Different characteristics which arise from sexual reproduction and mutations

Question 9

Advantages of the human genome project (3 points)

Answer 9

Improved out understanding of genes linked to different types of disease

Helped in treatment of inherited disorders

Helped in tracing human migration patterns of the past