英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字，中文词皆可：

安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • Fertilization | Steps, Process, Facts | Britannica
    Fertilization, union of a paternal sperm nucleus with a maternal egg nucleus to form the primary nucleus of an embryo In higher organisms the essence of fertilization is the fusion of the hereditary material of two different sex cells Learn about the process of fertilization in this article
  • What Is Fertilization and How Does It Happen? - What to Expect
    Fertilization is when a man’s sperm combines with a woman's egg to form a single cell It’s one of the first steps toward pregnancy, but there are more hurdles to cross Where does fertilization occur?
  • Conception: Fertilization, Process When It Happens - Cleveland Clinic
    Conception and a positive pregnancy test After conception, a fertilized egg travels through your fallopian tubes to your uterus The fertilized egg (called an embryo) implants (attaches) into the wall of your uterus
  • What Are the Steps of Fertilization in Humans? - inviTRA
    Human fertilization is defined as the union between egg and sperm cells to cause a pregnancy In humans, fertilization is an internal process, which is to say, it takes place inside the body of females, particularly in the Fallopian tubes, hence the more specific term natural or 'in vivo' fertilization The egg-sperm binding can be performed in the lab, too
  • Conception: The Fertilization Process Starts With Ovulation
    Conception is the joining of a sperm and egg, also known as fertilization In most cases, conception occurs in a woman’s fallopian tube in the hours or days following sexual intercourse However, in cases of assisted reproduction, particularly in vitro fertilization, conception can occur in a lab
  • Fertilization - Definition, Types, Process - Biology Notes Online
    Internal fertilisation is the word used to describe fertilisation that takes place inside an organism’s body as opposed to external fertilisation, which occurs outside the body of the organism While internal fertilisation only happens in creatures with specific sex organs for receiving and delivering the sperms, such as reptiles, birds
  • Fertilization - Embryology
    Fertilization is the fusion of haploid gametes, egg and sperm, to form the diploid zygote Note though there can be subtle differences in the fertilization process which occurs naturally within the body or through reproductive technologies outside the body, the overall product in both cases is a diplod zygote In fertilization research, after humans the mouse is the most studied species
  • Fertilization in Humans - BYJUS
    Sex Determination Fertilization is the process in which a new cell is formed when two gametes (sex cells) –sperm and ova fuse together During this unbiased event, all genetic information is transferred from both the parents to their child and the gender of the child is determined
  • What is Fertilization? Steps, Process Facts - Apollo Hospitals
    Fertilization is the process in which the female and male gametes fuse to form a zygote, which later develops into an embryo During intercourse, the male sperms are ejaculated into the female that passes through the fallopian tube and combines with the ovum’s (egg) zona pellucida layer, forming a zygote (fertilized egg) The male body produces thousands of sperms
  • Fertilization – Human Reproduction: A Clinical Approach
    When the first sperm fuses with the oocyte, the oocyte deploys two mechanisms to prevent polyspermy, or penetration by more than one sperm Preventing polyspermy is critical because if more than one sperm were to fertilize the oocyte, the resulting zygote would be a triploid organism with three sets of chromosomes, and incompatible with life





中文字典-英文字典  2005-2009