How do I make pique like my grandfathers?

How do you make a punett square with two of the grandfathers and the parents?

• HELP!!! They only give 4 things.Mom, Dad, Granma, Grandad.

• Answer:

  You can't do all at once, of course. You can only do a punnett square with a pair. You didn't ask the number of characteristics and which is the recessive and dominant allele, so I can't really help you that much. You will probably have to do the punnett square with the grandparents first. If you're doing a punnett square with only one character, for example 'the presence of the widow's peak.' the widow's peak is a dominant character. I'll label the allele for widow's peak as W, and the allele for the non-widow's peak as w. Get the genotypes of the parents for this character. Example: father is Ww (heterozygous for the character) and ww for the mother (homozygous recessive). Now, get the gametes: W and w for the father, w and w for the mother. Then, proceed with the punnett square. Put the gametes of the father on the topmost part, and the gametes of the mother on the leftmost part (if you're using the 'diamond' punnett square, the father's on the upper right, and the mother's on the upper left. You can change the position of the gametes, by the way. I'm just putting them on a specific position to make this clear). Then, combine the gametes of the father with the mother's, and put the resulting genotypes on the 4 blank squares. (the resulting genotypes are 2 Ww's and 2 ww's). These are the probabilities of the resulting genotypes of the offspring: 50% will be heterozygous for the character and 50% will be homozygous recessive. The probability of the resulting phenotypes: 50% of the offspring will have the widow's peak, and 50% will not.