Search results
Results from the WOW.Com Content Network
The population in different regions have varying amounts of infertility. Starting in the late 20th century, scientists have expressed concerns about the declining semen quality in men. A study was done in 1992 with men who had never experienced infertility showed that the amount of sperm in semen had declined by 1% per year since 1938.
Sterile males are deliberately produced by humans in several species for several unrelated purposes: Sterile insect technique – for insect pest control Cytoplasmic male sterility – for plant breeding
The development of a zygote into an adult is a complex and delicate process of interactions between genes and the environment that must be carried out precisely, and if there is any alteration in the usual process, caused by the absence of a necessary gene or the presence of a different one, it can arrest the normal development causing the non ...
The male-sterile line is maintained by crossing with a maintainer line carrying the same nuclear genome but with normal fertile cytoplasm. For crops such as onions or carrots where the commodity harvested from the F1 generation is vegetative growth, male sterility is not a problem.
Panthera hybrids are typically given a portmanteau name, varying by which species is the sire (male parent) and which is the dam (female parent). For example, a hybrid between a lion and a tigress is a liger, because the lion is the male parent and the tigress is the female parent.
Ringer's solution is a solution of several salts dissolved in water for the purpose of creating an isotonic solution relative to the body fluids of an animal. Ringer's solution typically contains sodium chloride , potassium chloride , calcium chloride and sodium bicarbonate , with the last used to buffer the pH .
The incentives were only available to low income men. Men were the target of sterilization because of the ease and quickness of the procedure, as compared to sterilization of women. However, mass sterilization efforts resulted in lack of cleanliness and careful technique, potentially resulting in botched surgeries and other complications. [29]
There is a myth that white tigers have an 80% infant mortality rate. However, the infant mortality rate for white tigers is no higher than it is for normal orange tigers bred in captivity. Cincinnati Zoo director Ed Maruska said: "We have not experienced premature death among our white tigers. Forty-two animals born in our collection are still ...