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When twins are the result of two eggs being fertilized at the same time (non identical twins) there is some evidence to show that there is a genetic basis for this kind of twins. However, it is only their mother that has any effect on the chances of having non identical twins; there is no known mechanism for a father to cause the release of more than one ovum
When twins are the result of the zygote splitting into two embryos (identical twins) then this is considered a random act nobody is responsible.
Sex determination in humans is primarily determined by the presence of the Y chromosome. Males have one X and one Y chromosome, while females have two X chromosomes. Therefore, it is the contribution of the male that determines the sex of the offspring.
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For what are genes on the y chromosome responsible?
Genes on the Y chromosome are responsible for male sex determination and other male-specific traits. They play a crucial role in the development of male reproductive organs and secondary sexual characteristics.
Explain mechanism of sex determination in humans?
In humans, sex determination is based on the presence or absence of the Y chromosome. If the individual has a Y chromosome, they will develop into a male (XY). If they do not have a Y chromosome, they will develop into a female (XX). Key genes on the Y chromosome, such as the SRY gene, trigger the development of male characteristics.
Does couplation occur in humans?
Yes, copulation does occur in humans. It refers to sexual intercourse between a male and a female that culminates in reproduction through the transfer of sperm from the male to the female's reproductive tract.
Why female anopheles mosquito is responsible to transfer plasmodium in humanbeing and why not in the male?
Male (and female) mosquitoes feed on flowers. However, it is only the female mosquito which bites humans. "She" does this in order to obtain proteins from the blood plasma, which she needs for her eggs. (The male mosquito does not need these proteins, hence it does not bite the human.) Since the female mosquito is the only one being exposed to human blood, it is the only one which will transmit its contents, including malaria. :)
Are plants female or male?
Plants can be both male and female, or have both male and female parts within the same plant. Some plants have separate male and female individuals, while others have flowers that contain both male and female reproductive organs.
Who is responsible for sex determination in humans the male or the female parent?
The sex determination in humans is determined by the male parent through the presence of the X or Y chromosome in the sperm. The female parent always contributes an X chromosome. If the sperm carries an X chromosome, the resulting offspring will be female (XX), and if it carries a Y chromosome, the offspring will be male (XY).
Who is responsible of increasing crime male or female?
male
What causes male humans to be male?
It happens in sexual intercourse. If the sperm is a male and the egg is female it will be male but if both are female, it will be female!
Which sex chromosome determines if an offspring is male or female in humans?
In humans, which sex chromosome determines if an offspring is a male or female?
What is the humans courtship pronouns?
The pronouns for humans in any context are: A male = he, him, his A female = she, her, hers Plural (male, female, or both) = they, them, theirs, their
Can humans only be male and female?
No, there is a condition called XXY where it is a cross over of male and female. Other than that, yes male and female are the standard.
What body system is responsible for breeding?
And male and female reproductive systems are responsible for breeding.
What were Franklin pierce parents?
They were humans. A male and female
What is male or female reproductive cell?
In humans a male reproductive cell is the sperm, while the female reproductive cell is the egg.
For what are genes on the y chromosome responsible?
Genes on the Y chromosome are responsible for male sex determination and other male-specific traits. They play a crucial role in the development of male reproductive organs and secondary sexual characteristics.
Explain mechanism of sex determination in humans?
In humans, sex determination is based on the presence or absence of the Y chromosome. If the individual has a Y chromosome, they will develop into a male (XY). If they do not have a Y chromosome, they will develop into a female (XX). Key genes on the Y chromosome, such as the SRY gene, trigger the development of male characteristics.
What are the effects of human sex chromosomes on sex determination?
If you have a Y, you're a male... if you don't, you're a female
