6.2 Patterns of inheritence Flashcards
What is continuous variation? What is an example?
When the individuals in a population very within a range. No distinct categories eg heigh and weight.
What is discontinuous variation? What is an example?
Where there are two or more distinct categories that each individual falls into with no intermediates. eg blood group.
What is phenotypic variation?
variation within an organisms phenotype.
What 3 factors can influence phenotypic variation?
- Genotype
- The environment
- Genotype and the environment
What is myogenic?
When characteristics are controlled by only one gene.
What is polygenic ?
where characteristics are influenced by many genes
What is a gene?
A sequence of bases on a DNA molecule that codes for a protein.
What is an allele?
When there is more then one version of the same gene they are called alleles.
What is a locus ?
the specific location where the allele for each gene is found on a chromosome.
What is a genotype?
It is all of the alleles an organism has.
What is a phenotype?
the characteristics of an organism
What is homozygous?
Where an organism carry’s two alleles that are the same. eg AA or aa
What is heterozygous?
When an organism carry’s two different alleles eg Aa
How is a dominant allele shown?
with a capital letter eg A
What is a recessive allele?
Those who’s characteristics only appear in the phenotype when two copies are present
