2017-2018学年高中英语Unit2CloningSectionⅠWarmingUpReadin
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The team reported their findings in this week’s Current Biology.
“Where these new mutations actually come from is still a mystery，” said Professor Harberd. “They may arise during the regeneration process itself or during the cell divisions in the donor plant that gave rise to the root cells from which the regenerate plants are created. We are planning further research to find out which of these two processes is responsible for these mutations. What we can say is that nature has safely been employing what you might call a ’cloning’process in plants for millions of years, and that there must be good evolutionary reasons why these mutations are introduced.”
Professor Harberd said, “While our results highlight that cloned plants and animals are very different, they may give us insights intoeplicate themselves, and how mutations arise during these processes which, ultimately, have an impact on human health.”
The new results suggest that variation in clones of plants may have different underlying causes from those of variation in clones of animals — where it is believed that the effect of environmental factors on how animal genes are expressed is more important and no similar high frequencies of mutations have been observed.
the difference between them? Please read the following passage to get the answer.
A new study of plants that are reproduced by cloning has shown why cloned plants are not identical.
Now, a team from Oxford University, the UK, and King Abdullah University of Science and Technology, Saudi Arabia, believe they have found out why this is the case in plants: the genomes ( 染 色 体 ) of regenerate plants carry relatively high frequencies of new DNA sequence mutations (变异) that were not present in the genome of the donor plant.
Scientists have known for some time that cloned organisms are not always identical: their observable characteristics and traits can vary, and this variation can be passed on to the next generation. This is despite the fact that they are derived (获得) from genetically identical founder cells.
Warming Up
1．How much do you know about clone? What is clone? And what
are natural clone and man-made clone? _C_l_o_n_e_i_s_a__w_a_y__o_f_m__a_k_i_n_g_a_n__e_x_a_c_t_c_o_p_y__o_f_a_n_o_t_h_e_r_a_n_i_m__a_l _o_r _p_l_a_n_t.________________________________________________ _N_a_t_u_r_a_l__c_lo_n_e__i_s__o_n_e__th__a_t _o_c_c_u_r_s__f_r_o_m__t_h_e__“_p_a_r_e_n_t_”__in___a _n_a_t_u_r_a_l _fo_r_m__o_f__c_lo_n_i_n_g_w__it_h_o_u_t_h__u_m_a_n__h_e_l_p_. ______________ _M__a_n_-_m_a_d_e___c_l_o_n_e___i_s___o_n_e___p_r_o_d_u_c_e_d____th_r_o_u_g_h____h_u_m__a_n _in__te_r_v_e_n_t_io_n__(介___入__)．_
Section Ⅰ
Warming Up & Reading — Pre-reading
1．What are the advantages and disadvantages of cloning? 2．Not only animals but also plants can be cloned. Do you know
“Where these new mutations actually come from is still a mystery，” said Professor Harberd. “They may arise during the regeneration process itself or during the cell divisions in the donor plant that gave rise to the root cells from which the regenerate plants are created. We are planning further research to find out which of these two processes is responsible for these mutations. What we can say is that nature has safely been employing what you might call a ’cloning’process in plants for millions of years, and that there must be good evolutionary reasons why these mutations are introduced.”
Professor Harberd said, “While our results highlight that cloned plants and animals are very different, they may give us insights intoeplicate themselves, and how mutations arise during these processes which, ultimately, have an impact on human health.”
The new results suggest that variation in clones of plants may have different underlying causes from those of variation in clones of animals — where it is believed that the effect of environmental factors on how animal genes are expressed is more important and no similar high frequencies of mutations have been observed.
the difference between them? Please read the following passage to get the answer.
A new study of plants that are reproduced by cloning has shown why cloned plants are not identical.
Now, a team from Oxford University, the UK, and King Abdullah University of Science and Technology, Saudi Arabia, believe they have found out why this is the case in plants: the genomes ( 染 色 体 ) of regenerate plants carry relatively high frequencies of new DNA sequence mutations (变异) that were not present in the genome of the donor plant.
Scientists have known for some time that cloned organisms are not always identical: their observable characteristics and traits can vary, and this variation can be passed on to the next generation. This is despite the fact that they are derived (获得) from genetically identical founder cells.
Warming Up
1．How much do you know about clone? What is clone? And what
are natural clone and man-made clone? _C_l_o_n_e_i_s_a__w_a_y__o_f_m__a_k_i_n_g_a_n__e_x_a_c_t_c_o_p_y__o_f_a_n_o_t_h_e_r_a_n_i_m__a_l _o_r _p_l_a_n_t.________________________________________________ _N_a_t_u_r_a_l__c_lo_n_e__i_s__o_n_e__th__a_t _o_c_c_u_r_s__f_r_o_m__t_h_e__“_p_a_r_e_n_t_”__in___a _n_a_t_u_r_a_l _fo_r_m__o_f__c_lo_n_i_n_g_w__it_h_o_u_t_h__u_m_a_n__h_e_l_p_. ______________ _M__a_n_-_m_a_d_e___c_l_o_n_e___i_s___o_n_e___p_r_o_d_u_c_e_d____th_r_o_u_g_h____h_u_m__a_n _in__te_r_v_e_n_t_io_n__(介___入__)．_
Section Ⅰ
Warming Up & Reading — Pre-reading
1．What are the advantages and disadvantages of cloning? 2．Not only animals but also plants can be cloned. Do you know