20.1 variation and inheritance Flashcards
1
Q
What is a genotype
A
Combination of alleles an organism inherits for a characteristic
The genetic makeup of an organism
2
Q
What is a phenotype
A
Observable characteristics of an organism
3
Q
What does homozygous mean
A
They have 2 identical alleles for a characteristic
Homozygous dominant or homozygous recessive
4
Q
What does heterozygous mean
A
They have 2 different alleles for a characteristic
The allele first the dominant phenotype is depressed
5
Q
What is discontinuous variation
A
Only 1 gene is involved and the environment has little affect
It can only appear in specific values
E.g. blood group
6
Q
What is continuous variation
A
2 extremes with every degree of variation possible in between
Lots of genes will be involved and the environment has a large affect
E.g. animal mass
