In: Biology
11. A] A young boy is diagnosed with sideroblastic anemia (skin
paleness, fatigue, dizziness and enlarged spleen and liver),
a
recessive, X-linked condition. If neither parent has sideroblastic
anemia, what are their genotypes?
B] An A/a; B/b dihybrid is test-crossed, and ¼ of the progeny
phenotypically resembles the dihybrid parent, while ¾
resembles the tester parent. If the dihybrid parent was selfed,
what would be the expected phenotypic ratio in the
progeny?
C] Two strains of S. cerevisae (yeast) are crossed of genotype a ;
B and A ; b (the two genes are on different
chromosomes and therefore independently assort). If a and b are
synthetic lethal, what percentage of sexual spores
would you find in a non-parental ditype (NPD) ascus from this cross
?