A system of sex determination known as haplodiploidy is found in honeybees. Females are diploid, and males (drones) are haploid. Male offspring result from the development of unfertilized eggs. Sperm are produced by mitosis in males and fertilize eggs in the females. Ivory eye is a recessive characteristic in honeybees; wild-type eyes are brown. a. What progeny would result from an ivory-eyed queen and a brown-eyed drone? Give both genotype and phenotype for progeny produced from fertilized and nonfertilized eggs. b. What would result from crossing a daughter from the mating in part (a) with a brown-eyed drone?
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- In honeybees, females are diploid (2n), meaning they have two sets of chromosomes, one from each parent. Males are haploid (n), having only one set of chromosomes, which comes from the mother without fertilization. - The trait for eye color in honeybees is Show more…
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Madhur L.
Honeybees have haplodiploid sex determination: females are diploid, developing from fertilized eggs, whereas males are haploid, developing from unfertilized eggs. Otto Mackensen studied linkage relations among eight mutations in honeybees (O. Mackensen. 1958. Journal of Heredity $49: 99-102$ ). The following table gives the results of two of MacKensen's crosses induding three recessive mutations: $c d$ (condovan body color), $h$ (hairless), and $c h$ (chartreuse eye color). Queen genotype $$\begin{array}{cc}c d & h^{+} \\\hline c d^{+} & h \\h & c h^{+} \\\hline h^{+} & c h\end{array}$$ Phenotypes of drone (male) progeny 294 cordovan, 236 hairless, 262 cordovan and hairless, 289 wild type 3131 hairless, 3064 chartreuse, 96 chartreuse and hairless, 132 wild type a. Only the genotype of the queen is given. Why is the genotype of the male parent not needed for mapping these genes? Would the genotype of the male parent be required if we examined female progeny instead of male progeny? b. Determine the nonrecombinant and recombinant progeny for each cross and calculate the map distances between $c d, h,$ and $c h .$ Draw a linkage map illustrating the linkage arrangements among these three genes.
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