In pigs, white coat (W) is dominant to black (w). Two white pigs are breed to produce 9 white and 2 black pigs. What are the genotype of the parents?

Two dice, one black and one white are rolled. The probability that sum of two no is 7 and no. of black greater than the no. of white is

Black coat of guinea pigs is a dominant trait, white is the recessive trait. When a pure black guinea pig is crossed to a white one, what fraction of the black "F"_(2) is expected to be heterozygous?

A bag contains 8 black and 5 white balls.Two balls are drawn from the bag.What is the probabilityboth the balls are white?