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Amazon fish challenges mutation idea

Amazon fish challenges mutation idea

Science
Evolutionary theory suggests that species favouring asexual reproduction will rapidly become extinct, as their genomes accumulate deadly mutations over time.But a study on an Amazon fish has cast doubt on the rapidity of this decline. Despite thousands of years of asexual reproduction, the genomes of the Amazon molly fish are remarkably stable and the species has survived. Details of the work have been published in Nature Ecology and Evolution.There are two fundamental ways in which new generations of life come to being - sexual and asexual reproduction.Sexual reproduction relies on special reproductive male and female sex cells, the eggs and sperm, joining together during the process of fertilisation.Each sex cell contains half the number of chromosomes of normal parent cells, then follow...
The huge challenges facing Zimbabwe's next leader

The huge challenges facing Zimbabwe's next leader

World
To get under the skin of the problems facing the incoming Zimbabwean president, you need to get out of the big cities and into rural areas where the bulk of the population live.Many eke out an existence in this economically crippled nation. People like Olivia Mshunga, who lives as the youngest of three generations on a small piece of land in Domboshava.Planting ground nuts in the sandy soil, she wants President-designate Emmerson Mnangagwa to lift her out of subsistence farming.She says: "We are struggling for a long time, no money, no jobs in Zimbabwe, so we want to change our life."Video:Mnangagwa promises 'new democracy'Her next door neighbour Viola Shamuyarira has similar hopes, while Ms Shamuyarira's 18-year-old daughter Yardley just wants a better wheelchair so she can get a job as a...
Trump challenges China over North Korea

Trump challenges China over North Korea

World
Donald Trump has arrived in China after challenging those that still deal with North Korea to get tough, warning them "the weight of this crisis is on your conscience".The President and the First Lady met Chinese premier Xi Jinping and his wife after landing in Beijing on Air Force One.They descended from a red-carpeted staircase and were welcomed by impeccably uniformed guards and children waving US and Chinese flags.Image:The President got an enthusiastic welcomeMr Trump is making his first official visit to the world's most populous country, the third leg on a five-country 11-day Asian tour.He was treated to a lavish welcoming ceremony and has been given a tour of the Forbidden City, the location of China's ancient imperial palaces.Mr Trump and Xi Jinping will meet several times during ...