In Drosophila, the recessive, sex-linked genes abnormal eyes facet
(fa) and singed bristles (sn) show 18 percent recombination.
   a) If a singed male is crossed to afafa female, what phenotypes
        are expected in the F1?
     b) If the F1 males and females are inbred what phenotypic
         proportions would be expected to occur in F2 males and
          females?

In Drosophila, genes are located on chromosomes, and the inheritance of these genes follows certain patterns. Sex-linked genes are those genes located on the sex chromosomes, and their inheritance differs from that of autosomal genes. The sex chromosomes in Drosophila are X and Y, and females have two X chromosomes while males have one X and one Y chromosome.

The recessive sex-linked genes abnormal eyes facet (fa) and singed bristles (sn) show 18% recombination. Recombination refers to the exchange of genetic material between homologous chromosomes during meiosis. When two genes are located on the same chromosome, they tend to be inherited together. However, if they are located far apart on the chromosome, they may undergo recombination, resulting in new combinations of alleles.

a) If a singed male (XYSn) is crossed to an a+fa female (XXfafa), the F1 offspring would inherit an X chromosome from the female and a Y chromosome from the male. Therefore, all F1 females would be XfaY, and all F1 males would ______ _____ _______ _________ _______ ___ __________ _____ ________ _______ _________.
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