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Sex determination ,when the two sexes participating in sexual reproduction must be somewhat different from each other for a number of reasons.How is the sex of a newborn individual determined? Different species use very different strategies for this.Some rely entirely on environmental cues.Thus,in some animals,the temperature at which fertilised eggs are kept determines whether the animals developing in the eggs will be male or female.
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What is the definition of sex chromosomes?
A sex chromosome helps in the determination of sex in an organism.
Who is responsible for sex determination in humans the male or female?
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.
What is one of a pair of chromosomes that are involved in sex determination of an idividual?
One of the pair of chromosomes involved in sex determination is the Y chromosome. In individuals with a Y chromosome, they typically develop as males, while those without a Y chromosome develop as females.
How is sex determined and inherited?
Sex determination in humans is primarily governed by the presence of specific sex chromosomes, with females typically having two X chromosomes (XX) and males having one X and one Y chromosome (XY). The sex of an offspring is inherited from the parents through the combination of these chromosomes during fertilization; the father's sperm can contribute either an X or a Y chromosome, while the mother's egg always contributes an X chromosome. Thus, if the sperm carries an X chromosome, the offspring will be female (XX), and if it carries a Y chromosome, the offspring will be male (XY). This genetic mechanism is a key aspect of human reproduction and inheritance.
Do all sexually-reproducing organisms have the same sex chromosomes as human?
No, not all sexually-reproducing organisms have the same sex chromosomes as humans. Humans possess a XY sex-determination system, where males have XY chromosomes and females have XX chromosomes. Other organisms can have different systems; for example, birds typically have a ZW system, where males are ZZ and females are ZW, while some reptiles and fish may have varied systems. The diversity in sex chromosomes reflects the evolutionary adaptations of different species.
What are the methods used for sex determination in humans?
The methods used for sex determination in humans include genetic testing, ultrasound imaging, and physical examination of external genitalia. Genetic testing can identify the presence of specific sex chromosomes (XX for females, XY for males), while ultrasound can visualize the development of reproductive organs. Physical examination can also help determine the sex based on the presence of male or female genitalia.
What are chromosomes that are not associated with sex determination known as?
Chromosomes that are not associated with sex determination are known as autosomes.
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).
What is the definition of sex chromosomes?
A sex chromosome helps in the determination of sex in an organism.
What are the four stages of sex determination in humans?
The 4 stages of sex determination in human beings are as follows:# Genetic sex - the sperm and egg fuse and this determines whether the individual is XX (female) or XY (male) # Gonadal sex - the formation of ovarian follicles which will later produce ova (female) or sertoli cells which will later produce sperm (male) # Ductal sex- the formation of ductal structures # Genital sex - the formation of the external genitalia
What is a autosome?
An autosome is a chromosome that is not involved in determining an individual's sex. In humans, autosomes exist in pairs (one from each parent) and carry genetic information related to various traits and characteristics other than sex determination. Humans typically have 22 pairs of autosomes.
What has the author James J Bull written?
James J. Bull has written: 'Evolution ofsex determining mechanisms' -- subject(s): Evolution, Evolution (Biology), Genetic Sex determination, Sex Determination, Sex chromosomes, Sex differentiation
Who is responsible for sex determination in humans the male or female?
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.
Are sex chromosomes homologous in humans?
Yes, sex chromosomes are homologous in humans.
What is one of a pair of chromosomes that are involved in sex determination of an idividual?
One of the pair of chromosomes involved in sex determination is the Y chromosome. In individuals with a Y chromosome, they typically develop as males, while those without a Y chromosome develop as females.
What is the biological sex of an individual with XY sex chromosomes in humans?
The biological sex of an individual with XY sex chromosomes in humans is typically male.
What is a male formula called?
A male formula is commonly referred to as "male" in the context of biological sex determination. In genetics, particularly in the context of sex chromosomes, the male formula is represented as XY, where "X" and "Y" indicate the specific sex chromosomes that typically characterize males in many species, including humans.
