The figure shows areas of yellow color (y), singed bristles (sn), or both adjace

Question

The figure shows areas of yellow color (y), singed bristles (sn), or both adjacent to each other (twin spots), based on what Curt Stem observed on the bodies of certain heterozygous Drosophila females. Using the figure for reference, complete the sentences using the words or phrases (not all words or phrases are Single yelow apot Twin spot Single singed spot the recessive nondi loss recessive adjacent both duplicaton Xo each other Stern observed that in a small number of females having the oatch of yellow appeared, indicating that a group of cells carried oniy the recessive Similarly, a small number of different females that also had the exhibited a patch of singed bristles; this qroup of cells must no camying the t cels and the singed-spot cells must have the chromosome of the X such that the aither the dominant alleleyor the dominant altele n XO due to mitotic nondis unction or other was eliminated. Twin spots, however, are adjacent islands of tissue that differ both from each other and the issue surrounding The twin soots indicated a different origin. Stern hyoothesized that these ad acent spots were the result of mitotic recombination resúlting from very rare crossover events A crossover between the y and sn loci would produce daughter cells having the genotype y sn ly sn andysny Because the d patches, each e cells le next to each other, their g the recessive phenotype for one of the alleles. y create adjacent

Explanation / Answer

y sn+/ y+ sn - yellow patch because y sn + is dominant

y sn+/ y+ sn - path of single bristle

gap filling

1.other mutations of x chromosome

2. rare cross over event between two sister chromatids of hologous chromosomes.

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