问题 单项选择题

某种鱼的鳞片有4种表现型:单列鳞、野生型鳞、无鳞和散鳞,由位于两对同源染色体上的两对等位基因决定(分别用Aa、Bb表示),且BB对生物个体有致死作用。将无鳞鱼和纯合野生型鳞的鱼杂交,F1代有两种表现型,野生型鳞的鱼占50%,单列鳞鱼占50%;选取F1中的单列鳞的鱼进行互交,其后代中有上述4种表现型,这4种表现型的比例为6∶3∶2∶1.则F1的亲本基因型组合是()

A.aaBb×AAbb或aaBB×AAbb

B.AABb×aabb

C.aaBb×AAbb

D.AaBB×AAbb

答案

参考答案:C

单项选择题

Questions 16-20At first glance, why anyone would want to save California condors is not entirely clear. Unlike the closely related Andean condors with their white neck fluff or king vultures with their brilliant black-and-white colour, California condors are not much to see. Their dull black colour-even when contrasted with white underwings-featherless head and neck, oversized feet and blunt talons are hardly signs of beauty or strength. Their appeal begins to become evident when they take flights. California condors can soar almost effortlessly for hours, often covering hundreds of miles a day-far more than other creatures of the air. Only occasionally do they need to flap their wings-to take off, change direction or find a band of warm air known as thermal to carry them higher.When it was discovered that the condor population was becoming dangerously small, scientists and zookeepers sought to increase condor numbers quickly to preserve as much of the species’ genetic diversity as possible. From studying wild condors, they already knew that if a pair lost an egg, the birds would often produce another. So the first and sometimes second eggs laid by each female in captivity were removed, artificially incubated, and the chicks raised using hand-held puppets made to look like adult condors. Such techniques quickly proved effective.Despite these successes, the effort to save California condors continues to have problems, evoke criticisms and generate controversy. Captive-hatched condors released to the wild have died at what to some people are alarmingly high rates. Others have had to be recaptured after they acted foolishly or became ill. As a result, the scientists, zookeepers and conservationists who are concerned about condors have bickered among themselves over the best ways to rear and release the birds.Some of the odd behavior on the part of these re-released birds is hard to explain. At times they landed on people’s houses and garages, walked across roads and airport runways, sauntered into park visitor centers and fast food restaurants, and took food offered by picnickers and fishermen. None are known to have died by doing so, though. Most recently, some of the first chicks hatched in the wild died after their parents fed them bottle caps, glass shards, pieces of plastic and other man-made objects that fatally perforated or blocked their intestines. These deaths may be due to the chicks’ parents mistaking man-made objects for bone chips eaten for their calcium content.Mike Wallace, a wildlife specialist at the San Diego Zoo, has suggested that some of the condors’ problems represent natural behavior that helps them survive as carrion eaters. The real key to successful condor reintroduction, he believes, lies in properly socializing young condors as members of a group that follow and learn from older, preferably adult birds. That, he argues, was missing from earlier condor releases to the wild. Typically, condors hatched in the spring were released to the wild that autumn or winter, when they were still less than a year old. Now, condor chicks at several zoos are raised in cave-like nest boxes. The chicks can see older condors in a large flight pen outside their box but cannot interact with them until they are about five months old. Then the chicks are gradually released into the pen and the company of the social group. The group includes adult and older juvenile condors that act as mentors for younger ones.

In the first stage of the conservation program _______.

A.eggs were removed from the nests of wild condors

B.female condors were captured and studied carefully

C.scientists and zookeepers tried to create genetic diversity

D.condors were induced to lay more than one egg

问答题

甲股份有限公司截至2007年初股本总额为人民币2800万元,其中向社会公开发行的股份为660万股,剩余部分由两位发起人持股。

(1)该公司2007年制订计划,并于7月初实施成功,又向社会公开发行股份4200万股。增发后,公司提出申请于2008年初经批准上市。

(2)甲公司上市后,根据要求,应增选3位独立董事,召开股东大会,出席会议的股东代表公司6600万股,其中包括两位发起人股东持有公司的股份2140万股;但参加会议的社会公众股东担心此次增选的3位独立董事会因大股东的投票权所操纵。

(3)独立董事增选成功后,甲公司于2008年6月5日对外发出公告,于6月18日召开董事会,该公司共有董事9人,其中出席会议的董事共7人(包括代表两位发起人大股东的董事5人),会议讨论的内容主要有:

①决定甲公司向两位发起人大股东购入主要材料的经营计划。

②根据公司经理的提名,聘任周某为公司负责经营业务的副总经理,周某年报酬额为12万元。

以上决议有6名董事同意,1名董事反对。

(4)甲公司接到某证券公司的意向通知,证券公司希望为甲公司融资。

(5)2008年8月5日甲公司对外披露其半年度报告;8月9日临时董事会又就公司的股权激励方案形成了决议。

要求:根据以上资料,结合《公司法》、《证券法》的规定,分析回答下列问题,并说明理由。

说明,甲公司召开董事会的时间和决议是否正确?