(a)[2]
Define what is meant by allele.
(b)[8]
In mice, the allele for black fur (B) is dominant to the allele for white fur (b). Two mice with black fur were crossed and produced offspring, all of which were black. One of these black offspring was then crossed with a mouse with white fur. Equal numbers of mice with black fur and with white fur were produced. Complete the genetic diagram to show the inheritance pattern in each cross.