A gene mutation occurs in a group of animals. As a result, they show a different pattern of behavior. Which of the following could be the behavior change? A. A group of bats start to be active during the day instead of at night. B. A herd of cows start to moo in a different ...
A snake that becomes smaller in size every year D. A mouse that can fly like a bird 相关知识点: 试题来源: 解析 A。解析:基因变异可能导致动物身体特征的改变。在选项A中,鸟的翅膀比正常的更长可能是基因变异的结果。选项B中鱼长时间离开水还能存活不符合大多数动物的生理特征,且这种情况很少由单纯...
Examples of diseases caused by gain-of-function mutations include achondroplasia and Huntington disease. Achondroplasia is caused by a mutation in FGFR3 gene and is characterized by short stature resulting from short limbs. Fibroblast growth factor receptor 3 negatively regulates bone growth. Ninety-...
Culture (behaviour based on socially transmitted information) is present in diverse animal species, yet how it interacts with genetic evolution remains largely unexplored. Here, we review the evidence for gene–culture coevolution in animals, especially
Modification of the strain through mutation can also be induced at will, by subjecting the genetic material to reaction with a variety of physical and chemical agents called mutagens. Examples of some known mutagenic agents are listed in Table 1. Each agent includes DNA alterations in a specific...
H. et al. Myosin gene mutation correlates with anatomical changes in the human lineage. Nature 428, 415–418 (2004). This work reveals that the loss of MYH16 in the human lineage after the separation from chimpanzees could have facilitated an increase in the size of the brain and the ...
Dominant or partly dominant mutations on X or Z chromosomes are exposed to selection twice as often in the homogametic as in the heterogametic sex. Such a mutation is therefore expected to go to fixation if it is beneficial to homogametic individuals (XX or ZZ) even if it is harmful ...
Indeed, examples of such gene families do exist in the placenta of domestic cattle and other ruminant ungulates. One example is a family known as the pregnancy-associated glycoproteins or PAGs. PAGs represent one of the major trophoblast secretory products of species in the Artiodactyla order (...
c Example of a mutation affecting a small number of parameters: the somatosensory cortex at Bregma +0.98 mm (red arrow 0.09 cm) and the cerebellum at Bregma −5.80 mm (Slitrk4−/Y) (image width 0.3 cm). d, e Examples of mutations having a specific impact on: d ...
Many species with separate male and female individuals (termed ‘gonochorism’ in animals) have sex-linked genome regions. Here, we investigate evolutionary changes when genome regions become completely sex-linked, by analyses of multiple species of flat