Reproduction, the genome and gene expression - AQA Evaluating sexual and asexual reproduction
Reproduction occurs in all organisms. DNA is important, as it allows new proteins to be synthesised. Mutations in the DNA can have serious implications.
Advantages and disadvantages of sexual and asexual reproduction
The advantages of sexual reproduction:
Produces variation in the offspring
The speciesA type of organism that is the basic unit of classification. Individuals of different species are not able to interbreed successfully. can adapt to new environments due to variation, which gives them a survival advantage
A diseaseIllness affecting plants and animals. is less likely to affect all the individuals in a population
Humans can speed up natural selection through selective breeding, which can increase food production
The advantages of asexual reproduction include:
the population can increase rapidly when the conditions are favourable
only one parent is needed
it is more time and energy efficient as you don't need a mate
it is faster than sexual reproduction
The disadvantages of sexual reproduction:
time and energy are needed to find a mate
it is not possible for an isolated individual
The disadvantages of asexual reproduction include:
it does not lead to variation in a population
the species may only be suited to one habitat
disease may affect all the individuals in a population