Segregation probabilities for two traits
Mendelian segregation can be looked at for more than one gene at once. To
start with, we'll examine it for genes that segregate independently. This
means that how the alleles of one gene segregate does not effect how the
alleles of another gene segregate. For example, in the pea plant there is
a gene for flower-color and a gene for height. Plants can have either red
or white flowers, and can be tall or short.
Suppose a plant has a red and a white
flower-color allele, and a tall and a short height allele. That plant has
a 0.5 chance of passing on the red or white allele, and 0.5 chance
of passing on the tall or short allele.
Therefore, the plant's chance of passing on the red and tall, red and short,
white and tall, or white and short alleles along together in combination
is 0.5*0.5 or 0.25.
THIS IS NOT FINIFSHED YET