Genetics: W. E. Castle Possible Cytoplasmic as Well as Chromosomal Con- Trol of Sex in Haploid Males
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No patrigenes required for femaleness in the haplodiploid wasp Nasonia vitripennis.
The parasitoid wasp Nasonia vitripennis is an emerging model organism for developmental and behavioral genetics. It reproduces by haplodiploidy; males typically develop parthenogenetically from haploid eggs and females from fertilized diploid eggs. A polyploid mutant strain is available in which females are triploid and lay haploid and diploid eggs that normally develop into males when unfertil...
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The phenomenon of chromosome, or genomic, imprinting indicates the relevance of parental origin in determining functional differences between alleles, homologous chromosomes, or haploid sets. In mealybug males (Homoptera, Coccoidea), the haploid set of paternal origin undergoes heterochromatization at midcleavage and remains so in most of the tissues. This different behavior of the two haploid ...
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N experiments already reported (RUSSELL and SAYLORS 1960; RUSSELL 1961 ) I we were able to induce loss of a sex chromosome by irradiating during the interval between sperm entry into the oocyte and the first cleavage. This interval is relatively long, and during a 4x-hour span within it, there is a change in sensitivity to sex-chromosome loss and to lethal effects. Since the chromosomal state o...
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