Others, like the anemone fish(小丑鱼), change from male to female.There are also some kinds of fish that change back and forth.How do these fish do such things? The gender of a fish is often decided by the temperature of the water.( )1. The underlined word “species” means “ in...
三、完形填空Do you believe some fish have the_1_to change their sex? Researchers have found 14 kinds of fish that canchange from female to male and 8 kinds of fish can change from male to female.Scientists_2_ one kind of fish have discovered that when the only_3_ in a group dies ...
Some like the kobudai change routinely from female to male. Others, like the clownfish, do the opposite, from male to female. Still others can switch back and forth depending on the circumstance, such as a variety of coral-dwelling gobies. And at least one species, the mangrove killifish, ...
Sequentially hermaphroditic fish change sex from male to female (protandry) or vice versa (protogyny), increasing their fitness by becoming highly fecund females or large dominant males, respectively. These life-history strategies present different social organizations and reproductive modes, from near-...
Within six months of being paired with another male, the dominant fish had grown its preoptic area to a size that made it indistinguishable from the same region in other female anemonefish brains. "After six months, this part of the brain is completely changed from a male brain to a female...
dominant male, with a blue head, protects a harem of yellow females. If the male is removed, the biggest female becomes male, in just 10 days. She changes her behavior in minutes, her color in hours. Her ovary becomes a testis and by 10 days it is making sperm, according to the ...
In many cases, sex change is cued by social factors, such as the disappearance of a male or female from a group. These phenomena reveal that the mechanisms of sex determination and sex differentiation in fishes, in being diverse and more plastic, differ from those of other higher vertebrates...
This is when the largest female fish in the group begins to change its appearance. She begins to grow larger in size. After a week,she starts changing color,from yellow to blue. Slowly? the changes take place. She begins behaving like a male. Two weeks later,black spots appear on her ...
Here we investigated the involvement of gonadotropins in sex change by determining the changes in gonadotropin receptor (GtHR) gene expression during the onset of sex change from female to male and male to female. The expression of the GtHR was found to be confined to the active gonad of the...
242 male and 236 female quails taken randomly from 43 sires and 129 dams (1:3 mating) obtained in single hatch from a large random mating quail population maintained at Central Poultry Farm, Patna constituted the genetic material to stud... P Kumar,S. B. VERMA,K. G. MANDAL,... - 《...