Flashcards in 19- variation and natural selection Deck (13)
differences between individuals of the same species
the differences between the features of different individuals.
the differences between individuals in their genotype
result of range of phenotypes between two extremes
eg; height, weight
definite fixed number of phenotypes
eg; blood groups, eye color, tongue rolling
genetic change in the base sequence of DNA, causing variation, and is way new alleles are formed
causes of mutation
1- ionizing raditation eg; x-rays
2- mutagenic substances eg; tobacco
3- heavy metals eg; lead, mercury
types of mutation
1- chromosome mutation eg; downs syndrome
2- genetic mutation eg; sickle cell anemia
symptoms of sickle cell anemia
- tired, shortness of breath
- heart palpitation
- limb swells
When organisms are well adapted & survive in a habitat because of variation
The change in adaptive features of a population over time as a result of natural selection.
process of adaptation
The process resulting from natural selection by which populations become more suited to their environment over many generations.