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Biology
Multicellular organisms
Variation and inheritance
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Created by
abbey baltazar
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There are two types of variation
Discrete
variation which is controlled by a
single
gene
Continuous
variation which is controlled by
several
genes (
polygenic
inheritance)
Gene
is a section of DNA which codes for one
protein
Allele are different forms of the same gene
Phenotype
is the physical description of a characteristic
Genotype is the description of the genes using letters to represent it
Dominant
alleles are
dominant
and are
expressed
if you
inherit
one
copy
to have this
characteristic
Recessive alleles are often masked by the dominant alleles and you would need two copies of the alleles to express the characteristic
Homozygous
is if you inherit two of the alleles
Heterozygous
is when you inherit 2 different alleles, one is dominant and the other is recessive
Phenotypic ratios are not always achieved because
fertilisation
is a
random
process
sample size
may be
dependent
, if the sample is too
small
then the
ratio
may not be shown