Module 4

Question 1

Advantages of asexual reproduction

Answer 1

• fewer stages so quicker
• produces clone: successful genotype maintained
• only one parent so can colonise new environment

Question 2

Advantages of sexual reproduction

Answer 2

• increases genetic diversity so greater chance of survival

Question 3

translation

Answer 3

• (mRNA attaches) to ribosomes
• (tRNA) anticodons (bind to) complementary (mRNA) codons;
• tRNA brings a specific amino acid;
• Amino acids join by peptide bonds;
• (Amino acids join together) with the use of ATP;
• tRNA released (after amino acid joined to polypeptide);
• the ribosome moves along the mRNA to form the polypeptide

Question 4

advantages and disadvantages of replanting hedges (6)

Answer 4

ADVANTAGES:
- increased biodiversity SO increased predators of pests
- increased predators of pests SO less damage to crops and more yield and income
- increased pollinators SO more yield and income
- more tourists SO more income

DISADVANTAGES
- reduced land area SO less crop growth and less income
- increased biodiversity SO increased pest population
- increased pest population SO less yield and less income
- increased interspecific competition SO less yield and less income
- more difficult to farm SO less yield and less income