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染色体变异是生物变异试题中的常见类型,它贯穿于细胞分裂、遗传等内容。近几年高考中,以染色体变异为背景的试题频出,尤其是染色体变异引发的配子问题考查形式多样。本文通过典型实例分析,多角度剖析染色体变异中配子产生情况,旨在加深对遗传变异内容的理解。一、染色体结构变异例1生物细胞减数分裂时,若两条非同源染色体相互交换片段(图1),由于同源部分的紧密配对,染色体之间容易出现异常的“十字型”结构现象,如图2所示。若该生物的基因型为AaBbHh,则此细胞产生的配子有哪些类型?
Chromosomal variation is a common type of biological mutation test, which runs through the cell division, genetic and other content. In recent years college entrance examination, chromosomal variation as the background of the frequent test questions, in particular, chromosome variation caused by gametormination problems in various forms. In this paper, through a typical case analysis, we analyze the generation of gametes in chromosomal variation from multiple perspectives and aim to deepen the understanding of the content of genetic variation. First, the chromosome structure variation Example 1 biological cells meiosis, if two non-homologous chromosomes exchange fragments (Figure 1), due to the close match of the homologous, chromosomal prone to abnormal “cross” Structure phenomenon, as shown in Figure 2. If the organism’s genotype is AaBbHh, what types of gametes are produced by this cell?