Which types of phenotypic ratios are likely to occur in crosses when dealing with a single gene pair for which all the genotypic combinations are of equal viability?
A) 9:3:3:1, 27:9:9:9:3:3:3:1 B) 12:3:1, 9:7 C) 1:2:1, 3:1 D) 2:3, 1:2 E) 1:4:6:4:1, 1:1:1:1
Albinism, lack of pigmentation in humans, results from an autosomal recessive gene (a). Two parents with normal pigmentation have an albino child. a() What is the probability that their next child will be albino? b() What is the probability that their next child will be an albino girl? c() What is the probability that their next three children will be albino?