But now manatees are facing a new challenge: they can't get enough to eat. Many of the beds of sea grass that manatees depend upon have been killed by human-caused pollution. Sea grass began to disappear around 2011. Warming seas, combined with polluted water and fertilizers that have wash...
Sexual reproduction increases the chances of acquiring favorable mutations and is unlikely to propagate deleterious ones. Genetic diversity within a group of offspring is advantageous as the local environment changes. This idea becomes clear when we examine organisms that can reproduce both sexually and ...
has a store of various types and forms hidden as recessivemutationsin every natural population of wild animals and plants. It is thisaccumulatedmutation pool that is exploited by humans inbreeding. Such interference, calledartificial selection, plays a truly creative role in the formation of modern ...
2009). It is not clear whether gorilla retains additional X-degenerated genes that are lost in the human MSY since the gorilla Y chromosome has not been fully sequenced. Chimpanzee also lost 3 of the 9 gene families by frameshift mutations, albeit it has 11 more palindromes than those in ...
Theoretical analyses of selection on mutations affecting female responsiveness to male traits suggested that sexually antagonistic selection and traditiona... C Cordero,WG Eberhard - 《Evolutionary Ecology》 被引量: 524发表: 2005年 Sexual Selection and Reproductive Competition in Insects Theoretical analyses...
studies that have investigated the plasma and CSF levels of oxytocin, mutations in the genes for oxytocin or oxytocin receptors, and responses to the administration of oxytocin [98]. Interestingly, in humans, comfortable physical contact increases the endogenous secretion of oxytocin [99]. Oxytocin ...
Other physical adaptations that have structurally modified animals to improve their chances of survival include webbed feet, sharp claws, large beaks, wings, feathers, fur, and scales. Behavioral Adaptions Behavioral adaptations include an animal's actions, which typically are in response to external ...
The whales have mutations in a gene called ERCC1, which is involved with repairing damaged DNA, that may help protect the whales from cancer, a potential cause of death. Furthermore, another gene, called PCNA, has a section that has been duplicated. This gene is involved in cell growth an...
That is in addition to several unique mutations, including a silver color. The main difference between the sexes is that the males exhibit brighter purple feathers, while the females have a paler purple breast. The male is also the only one that explicitly sings, but both sexes can produce ...
Here we performed single-sample metatranscriptomic sequencing of internal tissues from 461 individual fur animals that were found dead due to disease. We characterized 125 virus species, including 36 that were novel and 39 at potentially high risk of cross-species transmission, including zoonotic spill...