Genetic linkage mapping in aspen Populus tremula L. The obscure events contributing to the evolution of an incipient sex chromosome in Populus : a retrospective working hypothesis. Genomes 425—36 Nei M. Keinath M.
The aforementioned developmental pathway regulates sex determination in somatic tissues. Genetics of house flies: variability studies with North Dakota, Texas, and Florida populations. The house fly tra mutation produces a situation reminiscent of that observed in naturally occurring systems in which maternal genotype determines sex, such as Chrysomya rufifaciessuggesting a mutational mechanism by which maternal effect sex determination can evolve Scott et al.
Females that were heterozygous for the Ag allele failed to activate Md-tra in the germline because the germline activity of M inhibits Md-tra and produced all male offspring Hediger et al. This is the key difference between autosomes and sex chromosomes.
The A male and B female Drosophila sex-determination pathways are shown, along with the house fly C male-determining pathway, D canonical female-determining pathway, and E female-determining pathway via the action of Md-tra D.
The first was a report of about eightfold greater resistance to dichlorodiphenyltrichloroethane in males than females in the Canberra strain, but the linkage of resistance and M was not reported Kerr
Release of sterile males has been a great success for some Diptera, such as screw worm Cochliomyia hominivorax Knipling They found slowed reproduction at the dairy in winter and early spring due to chronically low temperatures.
Homomorphic nature of the autosomes and heteromorphic nature of the male sex chromosome is clearly evident from this figure Credit: U. Bioessays, 15— Methods of genetic analysis of insecticide resistancepp. Journal List G3 Bethesda v. Genetics 50 : —
For more than a century, the evolution of the sex chromosomes and the genetics of sex determination have been the source of some of the most intriguing questions in evolutionary biology and have been the focus of many genetic and cytological studies see for example [ 1 — 12 ].
Identification of a new repetitive element in the sex chromosomes of Leporinus elongatus Teleostei: Characiformes: Anostomidae : New insights into the sex chromosomes of Leporinus. Dobashi, Y. It may be that these authors studied a different population of O.