A3.1 - Diversity of organisms

Question 1

Define an orgnanism (2)

Answer 1

biological system that functions as an individual life form

composed of cells

Question 2

Define a population

Answer 2

group of organisms of the same species in same area

Question 3

Define a community (2)

Answer 3

populations of multiple different species

occupying same geographical locations at same time

Question 4

Define variation

Answer 4

differences between members of a group

Question 5

Define discrete variation (3)

Answer 5

traits that can be put into distinct quantitative categories

influenced by one or few genes

e.g blood type, eye colour, dominance

Question 6

Continuous variation (4)

Answer 6

traits that vary along a quantitative continuum

results from complex interactions between many different genes

environment often plays a significant part in phenotype expression

e.g height, body mass

Question 7

Causes of variation within a species (4)

Answer 7

mutation

gene flow

meiosis

sexual reproduction

Question 8

Define morphological concept of species

Answer 8

classifying organisms based on physical traits

Question 9

Binomial nomeclature (2)

Answer 9

first part : genus

second part : species

Question 10

Limitations of biologocial calssification of species

Answer 10

existence of asexual reproduction