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In some organism if only half the sperm have X-chromosome and other half lack X chromosome this than type of sex-determination is-
- a)XX-XY
- b)XX-XO
- c)ZZ-ZW
- d)both 1 and 2
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Insome organism if only half the sperm have X-chromosome and other hal...
Sex Determination in Organisms
Sex determination is the process by which an organism develops as a male or female. It is determined by the combination of sex chromosomes an individual possesses. There are several different mechanisms of sex determination observed in various organisms.
Types of Sex Determination
There are four main types of sex determination mechanisms observed in organisms:
1. XX-XY system: This is the most common type of sex determination seen in mammals, including humans. In this system, females have two X chromosomes (XX) while males have one X and one Y chromosome (XY).
2. XX-XO system: This system is observed in some insects, such as grasshoppers. The females have two X chromosomes (XX) while the males have only one X chromosome (XO), lacking a Y chromosome.
3. ZZ-ZW system: This system is observed in birds, reptiles, and some fish. In this system, males have two Z chromosomes (ZZ) while females have one Z and one W chromosome (ZW).
4. Temperature-dependent sex determination (TSD): This mechanism is observed in some reptiles, such as turtles. The sex of the offspring is determined by the temperature at which the eggs are incubated.
Half Sperm with X-Chromosome and Half without X-Chromosome
In the given scenario, if only half of the sperm have an X-chromosome and the other half lack an X-chromosome, it suggests that the organism follows an XX-XO system of sex determination. Let's understand why:
- In the XX-XO system, females have two X chromosomes (XX) and are homogametic, meaning they produce gametes with one X chromosome each.
- Males, on the other hand, have only one X chromosome (XO) and are heterogametic. They produce two types of gametes: one with an X chromosome and the other without an X chromosome.
- If only half of the sperm have an X-chromosome and the other half lack an X-chromosome, it indicates that the organism is male (XO) and produces two types of sperm: one with an X chromosome and the other without an X chromosome.
Conclusion
Based on the given information, the type of sex determination observed in the organism is the XX-XO system. This system is characterized by females having two X chromosomes (XX) and males having only one X chromosome (XO). The presence or absence of an X chromosome in the sperm determines the sex of the offspring in this system.
Sex determination is the process by which an organism develops as a male or female. It is determined by the combination of sex chromosomes an individual possesses. There are several different mechanisms of sex determination observed in various organisms.
Types of Sex Determination
There are four main types of sex determination mechanisms observed in organisms:
1. XX-XY system: This is the most common type of sex determination seen in mammals, including humans. In this system, females have two X chromosomes (XX) while males have one X and one Y chromosome (XY).
2. XX-XO system: This system is observed in some insects, such as grasshoppers. The females have two X chromosomes (XX) while the males have only one X chromosome (XO), lacking a Y chromosome.
3. ZZ-ZW system: This system is observed in birds, reptiles, and some fish. In this system, males have two Z chromosomes (ZZ) while females have one Z and one W chromosome (ZW).
4. Temperature-dependent sex determination (TSD): This mechanism is observed in some reptiles, such as turtles. The sex of the offspring is determined by the temperature at which the eggs are incubated.
Half Sperm with X-Chromosome and Half without X-Chromosome
In the given scenario, if only half of the sperm have an X-chromosome and the other half lack an X-chromosome, it suggests that the organism follows an XX-XO system of sex determination. Let's understand why:
- In the XX-XO system, females have two X chromosomes (XX) and are homogametic, meaning they produce gametes with one X chromosome each.
- Males, on the other hand, have only one X chromosome (XO) and are heterogametic. They produce two types of gametes: one with an X chromosome and the other without an X chromosome.
- If only half of the sperm have an X-chromosome and the other half lack an X-chromosome, it indicates that the organism is male (XO) and produces two types of sperm: one with an X chromosome and the other without an X chromosome.
Conclusion
Based on the given information, the type of sex determination observed in the organism is the XX-XO system. This system is characterized by females having two X chromosomes (XX) and males having only one X chromosome (XO). The presence or absence of an X chromosome in the sperm determines the sex of the offspring in this system.
Community Answer
Insome organism if only half the sperm have X-chromosome and other hal...
an individual with only a single X chromosome and no second X or Y (i.e., XO) develops as a female and begins making ovaries, although the ovarian follicles cannot be maintained. For a complete ovary, a second X chromosome is needed.
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Insome organism if only half the sperm have X-chromosome and other half lack X chromosome this than type of sex-determination is-a)XX-XYb)XX-XOc)ZZ-ZWd)both 1 and 2Correct answer is option 'D'. Can you explain this answer?
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