List the most obvious characteristics used to determine the sex of a fruit fly.

Question

List the most obvious characteristics used to determine the sex of a fruit fly. A fruit fly geneticist discovered a genetic mutation that resulted in pupae and young flies with dark pigment granules in the nuclei and cytoplasm of their fat cells. After studying the inheritance of the mutation, the geneticist named the gene Frd (for Freckled). What does this name tell you about the inheritance of this gene? In another strain of fruit flies, geneticists discovered a mutation producing flies with no gut muscles. They named the gene controlling this phenotype jeb (for jelly belly). What does this tell about the inheritance of this gene? Is the genetic map or linkage map produced by determining recombination frequencies an actual physical map of the chromosome? What additional techniques do geneticists use to more precisely locate relative positions of genes on chromosomes?

Explanation / Answer

1. On genetic basis, Males are distinguished as X0 genotype and females are XX genotype. Males have no other sex chromosome than X. female has two X chromosomes as sex chromosomes.

The most obvious phenotype characteristic is male drosophila (fruit fly) foreleg has a dark comb-like structure.

2. Freckled is used to distinguish that mutant drosophila larvae is easily visible by having dark pigments in their cells.

3. Without gut muscles drosophila’s gut will get very soft like pulpy. That’s why they termed jelly belly (jb).

4. To use precise location the scientist use genetic markers techniques like analysis by; Restriction fragment length polymorphism (RFLP), Amplified fragment length polymorphism, Short tandem repeat and Single nucleotide polymorphism.

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