69 Results
for term "sites"
- GENETICALLY REDUCED PROLIFICACY IN RATS...). The estimates of average resorption rates, resorbing embryos total placental sites in different species vary from .O1 to .39, while estimates of average total egg loss, normal placental sites total corpora lutea 1 - > vary from .07 to .37. These total mortality figures agree closely with estimates of prenatal ~~~
- EMBRYOLOGICAL AND CYTOLOGICAL STUDIES IN RATS HETEROZYGOUS FOR A PROBABLE RECIPROCAL TRANSLOCATION...be recognized by the small size of their implantation sites. These sites did not increase significantly in size after the 11th day. The average litter size of normal rats was approximately 8.0, whereas the average number of normal embryos per litter from semisterile rats was 3.0. I n 118 control matings only 8 ~~~
- A QUANTITATIVE HISTOLOGICAL STUDY OF THE PIGMENT FOUND IN THE COAT-COLOR MUTANTS OF THE HOUSE MOUSE. III. INTERDEPENDENCE AMONG THE VARIABLE GRANULE ATTRIBUTES...the total mass of pigment formed. There does seem to be an upper limit to the sites of pig- ment deposition within a medullary cell, since the highest number of medullary granules formed in the four highest eumelanotic types (two black-fuscous, two browns) show no significant differences (table 2). LUBNOW ~~~
- VARIATION, ISOLATING MECHANISMS, AND HYBRIDIZATION IN CERTAIN TOADS...consideration possess physio- logical differences which are expressed in breeding call, breeding time, and breeding site. The droning mating calls of B. fowleri and B. woodhousii are extremely similar; that of B. woodhousii is louder, but this is to be expected in view of the difference in size. In contrast ~~~
- THE RELATION BETWEEN LIGHT VARIEGATED AND MEDIUM VARIEGATED PERICARP IN MAIZE.... The fact was long since established by EMERSON that the change of variegated to self color involves a mutation at the P locus. The present investi- gation shows that the differential between light variegated and medium varie- gated, on the other hand, rests upon a factor at a site distinct from P ~~~
- ANALYSIS OF PLEIOTROPISM AT THE W-LOCUS IN THE MOUSE: RELATIONSHIP BETWEEN THE EFFECTS OF W AND Wv SUBSTITUTION ON HAIR PIGMENTATION AND ON ERYTHROCYTES...tissues come directly or indirectly from the primitive mesenchyme (BLOOM 1938), and the main sites of haematopoiesis are successively the yolk sac, the liver, and the bone marrow. All hair pigment in the mouse is believed to come from melanophores which migrate out from the neural crest between the eighth ~~~
- EVIDENCE FOR A SEX-LINKED LETHAL IN THE HOUSE MOUSE.... The corpora lutea of pregnancy, placental resorption sites and viable embryos were counted ; pre-and post-implantation losses were thus numerically dis- tinguishable. L , L 4 v L. I 5 f. Sex ratio In December 1946, it was noticed that some of the daughters of A-strain 9 No. 7 (one of the mice received three ~~~
- ALLELIC AND NONALLELIC GENES CONTROLLING HOST SPECIFICITY IN A BACTERIOPHAGE...that the two mutations have both left their marks in the stock hc7, and therefore that at least one of them has occurred in a mutational locus distinct from the site of the mutation ht l . It is of same interest that these experiments were done before any crosses had been made with the stocks ht5 and hc7, so ~~~
- A QUANTITATIVE HISTOLOGICAL STUDY OF THE PIGMENT FOUND IN THE COAT-COLOR MUTANTS OF THE HOUSE MOUSE. IV. THE NATURE OF THE EFFECTS OF GENIC SUBSTITUTION IN FIVE MAJOR ALLELIC SERIES...in granule number. This circumstance has already been studied rather thoroughly in the discussion sectiod of the third paper of this series, where it was postulated that there is an upper limit to the number of sites of pigment deposition per cell. These four genotypes have all reached this possible upper ~~~