hormones, pheromones and behaviour

Question 1

hormones

Answer 1

• chemical messengers secreted by endocrine glands
• directly enter the bloodstream
• several seconds

Question 2

pheromones

Answer 2

• act outside the body at a species level

Question 3

evolutionary biological explanations for pheromones

Answer 3

• adaptive to find the suitable mate, different genes

Question 4

MHC genes

Answer 4

• major histocompatibility complex
• possibly not pheromones
• can be smelt in sweat
• attraction to those with different MHC genes followed by mating, maximized immune response in offspring