gamete造句

• Two diploid gametes may fuse to give a tetraploid zygote , or gamete may develop directly by parthenogenesis
  两个二倍体配子融合可能产生一个四倍体合子，这样的配子也可以通过孤雌生殖直接发育而来。
• Autopoly - ploids may arise from the fusion of diploid gametes that have resulted from the nondisjunction of chromosomes at meiosis
  同源多倍体通常可能来自在减数分裂过程中染色体不分离导致的二倍体融合。
• Diplont a diploid organism that represents the vegetative stage in life cycles in which haploidy is restricted to the gametes
  二倍体生物：代表生活史中植物体阶段的二倍体生物，其单倍体仅局限于配子体。
• It is a multicultural flask - shaped structure made up of a narrow neck and a swollen base ( venter ) that contains the female gamete
  颈卵器状似长颈烧瓶，由一条细长的颈部和膨大的腹部（内含雌性配子）组成。
• Generally meiosis occurs before gamete formation , resulting in the gametes being haploid ( having half the normal number of chromosomes )
  在配子形成前通常会发生减数分裂，产生单倍体的配子（染色体数为正常的一半） 。
• When the gametes are readily distinguished as male or female , other therms may be used such as antheridium , archiegonum , or oogonium
  配子很快地分化为雌性或雄性以后，其他的细胞会形成如精子囊，颈卵器，卵囊等器官。
• The gametes fuse to form a zygote , which develops into the sporophyte , and the spores germinate and produce the gametophyte , so forming a cycle
  配子融合产生合子，进而发育为孢子体，孢子萌发产生配子体，形成一个循环。
• Karyogamy the fusion of two nuclei that exist within a common cytoplasm , as occurs in the formation of the zygote from two gametes
  核配：同一个细胞中两个核之间的融合现象称为核配，核配发生在两个配子结合成合子的过程中。
• The haploid plant produces gametes mitotically and is thus termed the gametophytes while the diploid plant produces spores meiotically and is called the sporophyte
  单倍体植物有丝分裂产生配子体，二倍体减数分裂产生孢子体。
• External fertilization occurs when gametes are expelled into a watery substrate from the parental bodies before fusion ; it is typical of sporebearing plants
  当配子在融合之前从亲本体中排出到有水介质时发生体外受精，这是孢子植物的特征。
• Segregation the separation of the two alleles of a gene into different gametes , brought about by the separation of homologous chromosomes at anaphase 1 of meiosis
  分离：同源染色体在细胞减数分裂后期中向细胞极迁移，使等位基因最终分向不同配子。
• It is due to the lack of homologous pairs of chromosomes , so chromosomes cannot pair in meiosis , and the resulting gametes may have extra or missing chromosomes
  这归因于染色体同系对的缺乏，以至于在减数分裂中染色体不能配对，导致配子有可能有额外或缺失染色体。
• Between 1940 and 1990 , tens of thousands more were conceived mainly using donated sperm , the low - tech end of gamete donation which has been around for over a century
  从1940年至1990年，又有数万名婴儿主要通过捐献配子出生，其中大多数是通过捐献者的精液人工授精的：这是较低级的配子捐献技术。
• Almost 18 , 000 babies have been born through donated gametes sperm and eggs and embryos in the uk since the regulatory human fertilisation and embryology authority was set up in 1991
  自从人工授精和胚胎学管理局hfea于1991年成立后，英国大约有1 . 8万婴儿通过捐献的配子精子卵子和胚胎孕育出生的。
• In an era of changing laws about the rights of gamete donors , this opens their relationship to possible intervention by the sperm donor if he decides he wants to play a role in raising the child
  在目前修改了配子捐献者权利的法律这样一个时代，如果他也想参与抚养孩子的话，那么她们的关系就可能受到干扰。
• The endosperm is usually triploid and develops from the primary endosperm nucleus , the triploid nucleus resulting from the fusion of one of the male gametes from the pollen tube with the polar nuclei in the embryo sac
  胚乳通常是三倍体，由初生胚乳核发育而来，三倍体核来源于花粉管中的雄配子与胚囊中两个极核的融合。
• In organisms showing alternation of generations , the gametes may be produced by mitosis in the haploid generation , or by meiosis in the diploid generation and give rise directly to gametes or gamete - producing cells
  在表现出明显世代交替的生物体中，配子可能是由单倍体世代发生有丝分裂产生，亦可由二倍体世代减数分裂直接产生配子体或配子母细胞。
• Characters controlled by the dna of extranuclear organelles are not inherited according to mendelian laws and are transmitted only through the female line , since only the female gametes have an appreciable amount of cytoplasm
  由于细胞质大多来自母体所产生的配子，所以由细胞核外的细胞器的dna所控制的遗传性状一般只随母系而遗传，也不符合孟德尔定律。
• They may only check with the hfea that they are not related to someone they intend to marry or ask the hfea presumably they have to be , firstly , suspicious if they were the product of donated gametes or embryos when they reach 18
  他们只能通过hfea证实自己和结婚对象没有血缘关系如果他们怀疑自己是捐献配子或胚胎的产物，他们在18岁后也可向hfea查询。
• This means changing the genome of either a gamete ( sperm or egg ) or a zygote ( a single cell formed either by fertilisation or by somatic cell nuclear transfer , a . k . a . cloning ) so that people are born with a designed genetic alteration
  这意味着改变配子（精子或卵子）或合子（由受精或体细胞核移植形成的一个细胞，核移植也称克隆） ，以至于人是由一种设计了的遗传变化而出生。