作者dumdum (欠一個勇敢)
看板TransBioChem
標題[問題] 生物(DNA)三題
時間Mon Jul 12 15:36:06 2010
1.Sexual reproduction
A.leads to uniform characteristics in a population.
B.results in new combinations of genetic traits.
C.produces genetic clone.
D.requires less tissue differentiation than asexual reproduction.
E.produces genetic clones and requires less tissue differentiation than
asexual reproduction.
2.Crossing over is one of the most important events in meiosis because
A.it produces new arrays of alleles on chromosomes.
B.homologous chromosomes must be separated into different daughter cells.
C.the number of chromosomes allotted to each daughtrt cell must be halved.
D.homologous chronatids must be separated into different daughter cells.
E.all of these.
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