Two Genes ( a and B ) Are Located on Each

question 34

Multiple Choice

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

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