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单词 pachynema
释义

pachynema /pæki'ni:mə/

英汉-汉英词典
n. 粗线期
词组 | 习惯用语
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  • machinery n. (总称)机器 体系, 机构
  • spaceman n. 宇航员,太空飞行员;太空人
  • pachysandra n. 富贵草属长青地被植物
  • panache n. 羽饰;灿烂;耍派头
  • pachyderm n. 厚皮动物
pachynema n. [细胞] 粗线期;粗丝

网络短语:
pachynema a 粗线期
Clarias pachynema 厚丝胡鲶
Trpistra pachynema Wang Tang 释义粗丝开口箭
英语百科

Meiosis

In meiosis, the chromosomes duplicate (during interphase) and homologous chromosomes exchange genetic information (chromosomal crossover) before a first division, called meiosis I. The daughter cells divide again in meiosis II, splitting up sister chromatids to form haploid gametes. Male and female gametes fuse during fertilization, creating a diploid cell with a complete set of paired chromosomes.
A video of meiosis I in a crane fly spermatocyte, played back at 120× the recorded speed.
Gametic life cycle.
Zygotic life cycle.

Meiosis /mˈss/ is a specialized type of cell division that reduces the chromosome number by half. This process occurs in all sexually reproducing single-celled and multicellular eukaryotes, including animals, plants, and fungi. Errors in meiosis resulting in aneuploidy are the leading known cause of miscarriage and the most frequent genetic cause of developmental disabilities.

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更新时间:2025/6/17 0:43:34