时间:2019-01-08 作者:英语课 分类:Scientific American(五)月


英语课

This is scientific American's 60-Second Science, I'm Karen Hopkin, this'll just take a minute.


 


If there’s anything better than a fresh, ripe, tomato, it’s a gigantic fresh, ripe tomato. And thanks to a couple of mutations, that’s exactly what we all enjoy every time we grab a tomato from the farmer’s market or the grocery store. In the wild, tomato plants actually produce some pretty small fruit. Today’s cultivated varieties serve up tomatoes that are a thousand times larger. This yummy enormity comes from mutations that affect the activity of two genes 3: one that controls cell division, so the more cells there are in a tomato, the bigger that tomato will be; and another that controls how many seed-bearing compartments 4 each fruit has. Again, the more compartments the bigger the fruit.


The compartment-number mutation 1, discovered by scientists at Cornell University, is described online in the current issue of Nature Genetics. The researchers found that no strains of wild tomato carry this mutation, which affects a gene 2 called fasciated. While all of the large-fruited modern varieties they surveyed have it, this suggests that the mutation occurred relatively 5 recently in tomato history, and that breeders then shared it with all their tomato-loving friends. So you can thank those fasciated mutants for teeing up your next BLT.


 


Thanks for the minute, for Scientific American 60-Second Science, I'm Karen Hopkin.


 



n.变化,变异,转变
  • People who have this mutation need less sleep than others.有这种突变的人需要的睡眠比其他人少。
  • So far the discussion has centered entirely around mutation in the strict sense.到目前为止,严格来讲,讨论完全集中于围绕突变问题上。
n.遗传因子,基因
  • A single gene may have many effects.单一基因可能具有很多种效应。
  • The targeting of gene therapy has been paid close attention.其中基因治疗的靶向性是值得密切关注的问题之一。
n.基因( gene的名词复数 )
  • You have good genes from your parents, so you should live a long time. 你从父母那儿获得优良的基因,所以能够活得很长。 来自《简明英汉词典》
  • Differences will help to reveal the functions of the genes. 它们间的差异将会帮助我们揭开基因多种功能。 来自英汉非文学 - 生命科学 - 生物技术的世纪
n.间隔( compartment的名词复数 );(列车车厢的)隔间;(家具或设备等的)分隔间;隔层
  • Your pencil box has several compartments. 你的铅笔盒有好几个格。 来自《简明英汉词典》
  • The first-class compartments are in front. 头等车室在前头。 来自《简明英汉词典》
adv.比较...地,相对地
  • The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
  • The operation was relatively painless.手术相对来说不痛。
标签: SSS mutation
学英语单词
account year
advance signal processing system
aerospace vehicle
airworthiness
alternating dry and wet test with sea water
alternatting current(ac) machine
antenna highness
anthracene nucleus
area of hysteresis loop
asphalt asbestos tile
asymptotic time
bairaiti cotton
beampower tube
benzenecarbaldehyde
bitches
campaign fund
cannabins
Canterburian
caprinized vaccine
charcoals
chlorolla
classical structured program
composite dike
cost plus percentage method
culture pan
Curculio arakawai
curved space-time
dead band
disk column absorber
echinodermatas
einstein's universe
electron suppressor slit
enteric
experimental steam-cooled fast reactor
foehn island
four pronged rectal speculum
gastral layer
giant polariton
gilding metals
grape
gravity raoller conveyer
gupta's subset selection method
had to do with
high-frequency process
high-precision regulator
ho-train
inlet flange diameter
insert into
intersubtype
Izmail
kalfax film
Kongoussi
lacustrine facies
left leaf
low-speed printer
mandazis
Mentone
micronicss
ngunis
nomina nuda
non erasable storage
non-selective fading
nonhomogeneous boundary condition
norton shores
office overhead
optically thin plasma
ovidweb
pantylid
performance of amplitude limiter
poculent
polyvinyl insulated cable
power semiconductor diode
precisioncolorimetry
prepartal
pseudomembranelle
quality factor,Q factor
ramjet engine
ranger district
rated impulse voltage
reinflates
repair funds
reunite
rocket launchers
rogin
rushford
samenampulle
Sesamum L.
shirted
simple element
six-course
slowly increasing distribution function
special character set
strike from
subcrustose
Swiss black poplar
ultrastructurally
unembellished
veneer of wall
vertical extinction coefficient
Vessel Going Against Stream
wayan