Punnet squares are a simple tool used to calculate the probability of obtaining a particular phenotype/genotype in the offspring based on the genotype of the parents.
A- No albinism
1 AA: 2 Aa : 1 aa
3 Normal : 1 Albinism.
Y- Male allele
¼. (As there is one phenotype out of four resultant phenotypes that is colourblind.
½ As there is two males and one of the males is red-green colourblind.
When performing crosses involving two genes you need a larger punnet square for example if you are crossing individuals AaBb x AaBb
You must first cross the gametes.
9 Yellow round: 3 Yellow wrinkled: 3 Green round : 1 Green wrinkled.
9 A-;B- : 3 A-;bb : 3 aa; B- : 1 aa; bb
Note the hyphen just means that the second allele could be an allele coding for a dominant phenotype or recessive phenotype regardless because there is presence of one allele coding for a the dominant phenotype those individuals will display the dominant phenotype for that gene.
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