Genetics and Evolution Flashcards
What is the definition of a species?
a group of organisms that can breed together and produce fertile offspring.
What is the definition of nature?
the basic characteristics of an individual as a result of inherited genes.
What is the definition of nurture
the basic characteristics of an individual as a result of the environment that you live in.
What are two examples of nurture characteristics?
personality and dying hair colours
What are two examples of nature characteristics?
eye colour and nose shape
how are identical twins produced?
one egg is fertilised by one sperm and it is split after fertilisation.
what percentage of DNA do identical twins share?
50%
what do identical twins share as they grow up?
the same environment
what do the twin studies tell us?
they compare environmental and inherited factors and characteristics.
what do twin studies compare?
nature VS nurture
What causes variation in identical twins?
environmental characteristics (nurture)
what causes variation in non identical twins?
inherited characteristics/ genetics (nature)
who created the theory of natural selection?
Charles Darwin
What is a mutation?
a change in genetic DNA
What is variation?
a range of characteristics