Genes Flashcards
What is a allele
An allele are different types of genes and can either be dominant or recessive
What is homozygous dominant
DD
What is homozygous recessive
dd
What is heterozygous
Dd
What does cystic fibrosis affect
Affects lungs and digestive system. They become clogged with mucus
What is cystic fibrosis caused by
A faulty recessive gene
What does polydactyly affect
Number of finger or toes
What is polydactyly caused by
A dominant allele gene
What did Mendel figure out
He figured out genetic inheritance before DNA was discovered
What is genetic variation
It is something that is caused due to your DNA e.g. eye colour
What is environmental variation
Something that has happened in your life to affect you e.g. scar
What is a mutation
A change in the gene
What is natural selection
Means that organisms better adapted to their environment will survive
What is Lamark’s theory
A characteristic which is used more and more by an organism becomes better and stronger and the one that isn’t disappears
