Three loci, mitochondrial malate dehydrogenase that forms a and b (MDHa, MDHb), glucuronidase that forms 1 and 2 (GUS1, GUS2), and a histone gene that forms + and ? (H+, H?), are located on chromosome #7 in humans. Assume that the MDH locus is at

position 35, GUS at position 45, and H at position 75. A female whose mother was homozygous for MDHa, GUS2, and H+ and whose father was homozygous for MDHb, GUS1, and H? produces a sample of 1000 egg cells. Give the expected numbers of the MDHa GUS2 H? cells she would produce. Assume no chromosomal interference.

A) 15 B) 135 C) 315 D) 0 E) 235


Answer: B

Biology & Microbiology

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