In this pedigree, 1-2 is
because they are shaded in.

feral cats are estimated to eat tens of millions of native animals each night in australia

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.

a chain link fence because there so tiny even my albino donkey can't get out