For Problem #2, change the letters used for dominant and recessive. It is difficult to distinguish between S and s. Use the letters G (dominant) and g (recessive) instead.
3. Fill in the questions from your lab manual in the spaces below.
1a. % of each genotype: __________
1b. % of each genotype: __________
% of each phenotype: ____________
% of each phenotype: ____________
1c. % of each genotype: __________
% of each phenotype: ____________
2a. % of each genotype: __________
% of each phenotype: ____________
2b. % of each genotype: ________
% of each phenotype: ____________
2. In humans, the inheritance of sickle cell anemia/trait is determined by a single pair of alleles that exhibit incomplete dominance. Individuals homozygous for the sickling gene (s) have sickle cell anemia. In double dose (ss), the sickling gene causes both normal and sickling hemoglobin. Usually, these individuals are healthy, but prolonged decreases in blood oxygen levels can lead to a sickle cell crisis. Individuals with the genotype SS form normal hemoglobin. Work out the following crosses:
a. Parental genotypes: SS X ss
% of each genotype:
% of each phenotype:
b. Parental genotypes: ss X Ss
% of each genotype:
% of each phenotype: