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two sexes
The two sexes of mice were equally sensitive to i.v.
      
Despite observing task related activation in the hypothesised areas in men and women, no areas significantly differentiated the two sexes.
      
Electrophoretic analysis revealed that this species exhibits a 3-allele polymorphism for MPI and that the proportions of the two most common alleles are very different in the two sexes.
      
The primary sex ratio is fixed at unity, parents can recognise the sex of individual offspring, and the returns (in offspring fitness) are different for the two sexes.
      
Signaling compatibility was assessed by comparing the amount of aggression toward young females by adult males when the two sexes were of the same vs the different stock of the same species.
      
Parameters required are the inbreeding effective numbers of male and female parents and the migration rates of the two sexes.
      
These differences were not due to differences in mortality of the two sexes but rather resulted from changing female sex-allocation decisions.
      
We found that male pups were born heavier than female pups, but that the growth rates and suckling behaviour were similar for the two sexes.
      
Mothers did not behave differentially towards offspring of the two sexes, except that mothers of male pups spent more time in visual contact with their pups.
      
We argue that reports of equal expenditure on the two sexes can be accepted as evidence of equal investment, provided that three assumptions are fulfilled.
      
The sex ratio bias may come about because (1) the actual production of the two sexes may be skewed and/or (2) there may be a sex bias in early nestling mortality contingent on parental condition.
      
Sex allocation theory for sequential hermaphrodites predicts the size at which an individual should change sex, given the different relationships between individual size and reproductive success in the two sexes.
      
Taken together, our results suggest that female yellow-legged gulls may be constrained in transferring androgens to their eggs by negative consequences on the viability of female offspring and growth of chicks of the two sexes.
      
This reflects sexual selection operating differently on the two sexes, as males and females are relatively similar in other life history traits, such as growth, mortality, age of maturity, dispersal, and parental expenditure.
      
Tardy females, impatient males: protandry and divergent selection on arrival date in the two sexes of the barn swallow
      
These findings suggest that arrival date is under divergent selection in the two sexes, providing a mechanism for the evolution of protandry.
      
Results: Only the estimated clearance circadian changes were different for the two sexes.
      
A recessive allele is protected in a panmictic dioecious population if the unweighted average of the recessive-to-dominant fitness ratios in the two sexes exceeds unity.
      
As in the single locus case, it is established that there are two classes of polymorphic equilibria, equilibria with even sex ratio and equilibria with equal allele frequencies in the two sexes.
      
Hybridization of a Bkm probe to genomic DNA showed slight differences between the two sexes.
      
 

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