VARIATION OF SCUTELLAR BRISTLES IN DROSOPHILA. III. SEX-DIMORPHISM
نویسندگان
چکیده
منابع مشابه
Variation of Scutellar Bristles in Drosophila
HE prime questions posed in genetic research are “what is the gene and how does it act to affect the phenotype” with much less attention given to the questions “what is the genotype and how does it determine the phenotype”. Geneticists interested in the genetic basis of continuously varying characters have to a large degree been involved in the second approach, attempting to describe the nature...
متن کاملVariation of Scutellar Bristles in Drosophila
UANTAL differences (key characters) have played a major role in syste0 matics, and, although there has been a great deal of discussion of the role of such quantal characters in speciation, there have been very few attempts to analyze the genetic basis of phenotypic constancy. The assumption that such phenotypic constancy is diagnostic of genetic constancy has been shown to be invalid for a rang...
متن کاملVariation of scutellar bristles in Drosophila, I. Genetic leakage.
HE number of bristles on the scutellum of Drosophila is characteristically Tfour. Flies occur infrequently which have more or less than four bristles. PAYNE (1918) selected for increase of the number of scutellar bristles, producing, after several generations of selection, flies with many extra scutellars. This showed that there was considerable unexpressed genetic variation for number of scute...
متن کاملVariation of scutellar bristles in Drosophila. IX. Chromosomal analysis of scutellar bristle selection lines.
Drosophila melanogaster, by reason of its small number of chromosomes, the lack of crossing over in the male, male hemizygosity for the 1st chromosome and the existence of inversion (dominant marked) chromosomes. provides a means of studying the chromosomal distribution of effective factors and the extent of the interactions between these factors. PAYNE (1918) used a combination of backcrossing...
متن کاملCorrelated response in scutellar bristles to selection for abdominal bristles in Drosophila melanogaster.
"DEL (1963) recently discussed the various ways in which genetic correlaR:ons may be generated. In particular he suggested that, when the development of two characters is dependent upon common resources (T), then it is reasonable to assume that a proportion ( a ) of T will be used to develop one character and the remaining proportion (1-a) will be used to develop the other character. Hence a an...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Genetics
سال: 1964
ISSN: 1943-2631
DOI: 10.1093/genetics/50.3.351