The majority of these reports 1-5 have referred to liveborn infants, who at sometime during their fetal stage presented, either by ausculatory or electrocardiographic methods, rapid and variable rhythms which converted spontaneously in pregnancy or remained unchanged and disappeared in the neonatal ...
Thus, the results of this study suggested that the sex ratio of the offspring was decreased at fertilization and not during the spermatozoa stage. 展开 关键词: TCDD Paternal exposure Sex ratio Spermatozoa 2-cell embryo DOI: 10.1016/j.reprotox.2009.09.009 被引量: 26 年份: 2010 ...
Detecting a normal heartbeat in a fetus is simply one indication of the overall health during pregnancy. Unborn babies will have a heartbeat early in the pregnancy, while the fetus remains within the embryonic stage of development. The answer to the question "when does a baby get a heartbeat...
dependent on the offspring sex as Box 1 How to Examine the Estrous Cycle in Rodents One simple way in which cyclicity can be examined is to collect vaginal smears on the day of testing and used to determine cycle stage in females as described previously (Nelson et al, 1982; Caligioni, ...
One simple way in which cyclicity can be examined is to collect vaginal smears on the day of testing and used to determine cycle stage in females as described previously (Nelson et al, 1982; Caligioni, 2009). Cycling should be done immediately after or as soon as possible after the behavio...
however, among azoospermic men, obstructive is confirmed to be superior. The therapeutic possibilities of ICSI go further as even spermatid conception was proposed for the treatment of azoospermia [Edwards et al. 1994] and the gametes at the elongated or at the round spermatid stage were used ...
(b) At which stage of life does gametogenesis begin in human male and female respectively ? (c )Name the organs where gametogensis gets completed in male and female respectively. View Solution In human females, meiosis-II is not completed until ...
When Is the First Ultrasound Done During Pregnancy? As part of parental care, ultrasounds have become very common and regular. In the early stages of pregnancy, ultrasounds are used to confirm a uterine pregnancy and fetal heartbeat. Ultrasounds that are performed during the later stages of pr...
In which phase of cell division is primary oocyte arrested? The primary oocytes become arrested inthe diplotene stage of prophase I(the prophase of the first meiotic division). Shortly before birth, all the fetal oocytes in the female ovary have attained this stage. ...
Quickening is when you first feel the movement, not the first time it occurs. Your baby may start moving around in the womb at about12 weeks, but you probably won’t be aware of any activity at this early stage. Fetal movement encompasses all types of action in the womb, i...