The Living World 6th Edition by George Johnson, Jonathan Losos,William Ober,Claire Garrison

Exercise 20

Many animals and plants bear recessive alleles for albinism, a condition in which homozygous individuals lack certain pigments. An albino plant, for example, lacks chlorophyll and is white, and an albino human lacks melanin. If two normally pigmented persons heterozygous for the same albinism allele marry, what proportion of their children would you expect to be albino