Variation and Inheritance Flashcards
what is continuous variation?
a factor that can be measured e.g height
what is disctrete variation?
is a factor that can be sorted into groups e.g hair, skin colour
what are alleles?
different forms of the same gene
what is a genotype?
a set of alleles that an organism possesese.g BB
what is a phenotype?
the apperance of an organism e.g blue eyes
what does a dominant charactaristic do to the other charactaristic?
hides it
what does a allele of a dominant charactaristic always look like?
always a capital letter e.g B
what is a reccessive allele?
the charactaristic that is hidden
what does the allele of the reccessive charactaristic always look like?
always a small letter e.g b
where do dominant alleles always show up in a organism?
in the phenotype (apperance) of an organism
where do reccessive alleles only show up in a organism and why?
only shows up in a phenoype of an organism if they are paired with another reccessive gene
do homozygous individuals have the same or different alleles?
the same alleles e.g BB or bb
do heterozygous individuals have the same or different allles?
different allles e.g Bb
why are observed ratios different to predicted?
fertilisation is a random process involvig a element of chance
