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    第2章 基因和染色体的关系 第1节 减数分裂和受精作用_第一课时_胡老师_三等奖
  • 第2章 基因和染色体的关系 第1节 减数分裂和受精作用_第一课时_胡老师_三等奖

    第2章 基因和染色体的关系 第1节 减数分裂和受精作用_第一课时_胡老师_三等奖

    更新时间:2024-11-23 13:14:46 视频时长:00:12:50

    温馨提示:逐字稿为字幕转换而成,没有通过校对,仅供参考,开通视频后可浏览完整内容。
    逐字稿:
    好, 请坐。 同学们, 长沙有和你一模一样的人吗? 没有。 有为什么? 即便是你的亲兄弟或者亲姐妹和你也会不同呢? 我们用一个视频微课来一起了解一下。 or why some siblings look so different from each other. the answer lies in the process of myosis which generates the gemmetes for reproduction. the diversity comes from several sources in profane s. one non sister chromatin s can exchange DNA through crossing over.
    increasing the genetic diversity of individual chromatin s. in antiphase one, the homologous chromosomes separate and move toward opposite poles. this process called independent assortment. produces four genetically distinct haploid ga mites. independent assortment, this alignment is random and ADDS to genetic diversity. the combination of independent assortment crossing over and the random pairing of gamut s during sexual reproduction. increases genetic diversity and explains why a child will not look exactly like his or her parents or siblings. 父亲体内众多的精原细胞, 他们的遗传物质相同吗? 相同为什么呢?
    因为。 它减数分裂都是中体细胞哦, 有丝分裂。 因为进行有丝分裂, 有丝分裂产生的子细胞与原细胞是相同的。 很好, 那同一对父母产生的后代, 为什么会不同呢? 佩服, 谢谢舒服姐,
    谢谢。 产生了不同的。 被子被子再结合, 形成了不同的受精卵, 发育成不同的个体。 那同一个个体产生的配子, 为什么会多种多样呢? 今天我们通过两个游戏来探究。 第一关请大家用染色体的模型来模拟非同源染色体自由组合之后所产生的配置。 为了区分配子的种类,

    字幕:00:00:04.620 --> 00:00:05.430 好,
    00:00:05.440 --> 00:00:07.060 请坐。
    00:00:07.580 --> 00:00:08.490 同学们,
    00:00:08.500 --> 00:00:12.180 长沙有和你一模一样的人吗?
    00:00:12.190 --> 00:00:12.800 没有。
    00:00:13.250 --> 00:00:14.080 有为什么?
    00:00:14.090 --> 00:00:18.260 即便是你的亲兄弟或者亲姐妹和你也会不同呢?
    00:00:18.270 --> 00:00:21.600 我们用一个视频微课来一起了解一下。
    00:00:25.250 --> 00:00:35.250 or why some siblings look so different from each other. the answer lies in the process of myosis which generates the gemmetes for reproduction.
    00:00:35.260 --> 00:00:44.180 the diversity comes from several sources in profane s. one non sister chromatin s can exchange DNA through crossing over.
    00:00:44.190 --> 00:00:47.940 increasing the genetic diversity of individual chromatin s.
    00:00:47.950 --> 00:00:49.640 in antiphase one,
    00:00:49.650 --> 00:00:57.590 the homologous chromosomes separate and move toward opposite poles. this process called independent assortment.
    00:00:57.600 --> 00:01:01.440 produces four genetically distinct haploid ga mites.
    00:01:01.450 --> 00:01:02.310 independent assortment,
    00:01:02.320 --> 00:01:13.700 this alignment is random and ADDS to genetic diversity. the combination of independent assortment crossing over and the random pairing of gamut s during sexual reproduction.
    00:01:13.710 --> 00:01:21.580 increases genetic diversity and explains why a child will not look exactly like his or her parents or siblings.
    00:01:25.740 --> 00:01:28.590 父亲体内众多的精原细胞,
    00:01:28.600 --> 00:01:31.190 他们的遗传物质相同吗?
    00:01:31.200 --> 00:01:32.770 相同为什么呢?
    00:01:32.780 --> 00:01:35.890 因为。
    00:01:39.940 --> 00:01:42.980 它减数分裂都是中体细胞哦,