Two genes (A and B) are located on each of two pairs of homologous chromosomes. In a tetrad, one sister chromatid
contains alleles ab, while the other sister chromatid contains alleles AB (upper and lower case indicate different alleles of
the same gene). Which genetic combinations are possible in the four gametes that are produced from a single chiasma
between these chromosome pairs?
a. Ab, AB, ab, aB
b. Ab, Ab, aB, aB
c. Aa, Bb, ab, Ab
d. Ab, Ab, AB, AB
e. AB, AB, ab, ab
ANSWER: a
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