问答题

减数分裂和有丝分裂时，染色体重组既可以发生在姊妹染色单体间又可以发生在非姊妹染色单体间。它们的遗传效应是什么?对后代的遗传变异有何影响?

【参考答案】

减数分裂和有丝分裂时发生的染色体重组，使遗传物质发生交换，但是姊妹染色单体间的染色体重组与发生在非姊妹染色单体间的染色体......

(↓↓↓ 点击下方‘点击查看答案’看完整答案 ↓↓↓)

<上一题目录下一题>

热门试题

问答题

孙悟空为医活人参树，去三岛求方，哪三岛?

未分类题

Text 5Kenya Wddlife Safari from ￡ 995DAY l LONDON NAIROBIDaylight flight to Nairobi. On arrival, check in at the Holiday Inn Mayfair Court.DAY 2-4 SAMBURU AND TREETOPSSet off on safari, driving north, to the west of Mount Kenya and across the equator (赤道) .2 nights at Samburu Lodge, including afternoon and morning game drives. Continue south to the Aberdare Mountains and the world famous Treetops, where we amve in time for tea on the rooftop platform, where you can watch the animals come down to the waterholE.DAY 5 LAKE NAIVASHAContinue from Thomason's Falls to Lake Nakuru. As well as the interesting bird life , it is here that you will have the best chance of seeing the black thino (犀牛) . Overnight at the Lake Hotel,NaivashA.DAY 6-8 MASAI MARAAfter a restful moming in this lovely lakeside setting, we drive to the Masai Mara game areafor a 3 night-stay at Keekerok LodgE.The vast plains of the Mara reach the Tanzanian borderwhere they join the famous Serenget , covering an area of over 6,000 square miles. The Mara is home to countless thousands of animals. Head out for morning and afternoon game drives.DAY 9 MASA MARA NAIROBI LONDONReturn to Nairobi for your ovemight flight back to London.72. This text is written mainly for people interested in________ .[A] traveling long distance[B] spending nights outdoors[C] watching animals in the wild[D] seeing different kinds of plants

A.DAY
B.
2
C.
DAY
D.
DAY
E.
DAY
F.
72.
G.
[A]

相关试题