Tagged Questions
1
vote
2answers
81 views
How to know if a woman is fertile without actually making her pregnant?
How to know if a human female is fertile (can give birth to child in future) without making her pregnant? Any signs, tests?
3
votes
1answer
50 views
How can the child and the mother have different blood types?
As far as I know the fetus is fed by the umbilical cord which basically connects his/her circulatory system with the mother's in order to supply oxygen and nutrients. But how is this possible if they ...
4
votes
1answer
113 views
Which sex has higher variance of reproductive rate in modern societies - male or females?
Who has a more varied reproduction rate in modern western societies - men or women? The average rate is the same of course, but I wonder which sex have higher variance - higher variance means that ...
7
votes
2answers
164 views
Do hormone drugs affect whether a person feels sexual attraction to males or females?
I know that ingesting testosterone and other hormonal drugs may stimulate libido and increase sexual desire.
But I wonder, if a man ingests female hormones such as estrogen, will he experience sexual ...
6
votes
2answers
234 views
Can positive and negative blood type of a couple lead to miscarriage?
I want to know can $+ve$ and $-ve$ blood group of a couple could be a cause of miscarriage in pregnancy?
3
votes
1answer
77 views
Are there records of monozygotic twins in which one experiences androgen insensitivity syndrome
I have given my high school biology students the thought experiment of "What would happen if a researcher induced twinning of a female zygote and then replaced one of the X Chromosomes with a copy of ...
3
votes
2answers
113 views
The probability of indirect human fertilization?
What is the probability of conception in situations when sperm isn't directly ejaculated into the woman's vagina, like:
The man's or the woman's hands come into contact with sperm, for example when ...
8
votes
2answers
150 views
Do twins “run in the family”?
My wife and I recently found out that we are going to have twins and so nearly everyone asks if we have a family history of twins. Now I know that the answer for me is that it doesn't matter—as ...
8
votes
1answer
121 views
A timeline of the odds for survival for fertilized eggs and fetuses
I'm looking for data to build a timeline of the odds for survival of a fertilized egg, i.e.,
What are the odds it'll last a week?
What are the odds it'll last a month?
2 months?
(and so on ...
3
votes
1answer
68 views
Predictable microchimerism
I read in New Scientist recently that microchimerism occurs between previously born siblings and grandparents, not just the mother.
Do we know which parts of the genome are likely to be transferred? ...
3
votes
1answer
60 views
What are possible health risks to women having large numbers of children?
What is the possible health issue the women would face in this record?
The record for most children born to a single couple belongs to the
first wife of Feodor Vassilyev of Russia. In 27 ...
5
votes
1answer
196 views
Is it purely the nervous system causing vaginal lubrication (arousal)?
My girlfriend was watching some documentary on TLC about a paralyzed woman getting pregnant. I believe that woman still has some feeling, as she spoke about feeling the effects of a bladder ...
5
votes
2answers
246 views
How are the gene sequences of individual sperm and egg cells “randomized”?
What I mean by "randomized" is, in the place where an egg cell or sperm cell is made, what is the mechanism by which each one is not made identically? Though I am a layman, I'm pretty sure that if the ...
14
votes
3answers
308 views
Are human fetuses more likely to be male?
Question: From a physiological point of view, when sex is determined in a human fetus, is it equally likely to be male or female?
Studies in this area typically measure age at birth, where the data ...
