Variation And Inheritance Flashcards
Describe discrete variation
Where a characteristic falls into a distinct group
Name the two types of variation
Discrete variation
Continuous variation
Describe continuous variation
Where there is a continuous range of characteristics
Give 2 examples of discrete variation
Blood type
Tongue rolling ability
Give two examples of continuous variation
Height
Shoe size
Define the term polygenic
When characteristics are controlled by many genes
What is an allele?
Alleles are different firms of a gene
What is a dominant allele ?
Dominant alleles always show up in the appearance of an organism even if there is only one copy present
What is a recessive allele?
This is the rarer characteristic as they only show up in the appearance of an organism if there are 2 copies present
What is a phenotype?
The appearance of an organism
What is a genotype?
The genes an organism possesses
If the two alleles are the same for example:
AA or aa
What is this known as?
Homozygous
If the two alleles are different for example:
Aa
What is this known as?
Heterozygous
