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XO type of sex determination and XY type of sex determination are the examples of
- a)male heterogamety
- b)female heterogamety
- c)male homogamety
- d)both (b) and (c)
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
XO type of sex determination and XY type of sex determination are the ...
In XO type and XY type sex determining mechanisms, males produce two different types of gametes, (a) either with or without X-chromosome (XO type), (b) some gametes with X-chromosome and some with Y-chromosome (XY type). Such type of sex determination mechanism is designated to be the example of male heterogamety. In both, females are homogametic and produce X type of gametes in both the cases and have XX genotype.
Most Upvoted Answer
XO type of sex determination and XY type of sex determination are the ...
The correct answer is option 'A': male heterogamety.
Explanation:
In sex determination, organisms can possess different systems. Two common systems of sex determination are XO and XY.
1. XO type of sex determination:
- In this system, females have two X chromosomes (XX), while males have only one X chromosome (XO).
- The presence of the Y chromosome determines the male sex, while the absence of the Y chromosome results in the female sex.
- Examples of organisms with XO sex determination include certain insects, such as grasshoppers and crickets.
2. XY type of sex determination:
- In this system, females have two X chromosomes (XX), while males have one X and one Y chromosome (XY).
- The presence of the Y chromosome determines the male sex, while the absence of the Y chromosome results in the female sex.
- Examples of organisms with XY sex determination include mammals, including humans.
Comparison:
- In both XO and XY sex determination, the male sex is determined by the presence of the Y chromosome.
- The key difference lies in the number of sex chromosomes present in females. In XO sex determination, females have two X chromosomes, while in XY sex determination, females also have two X chromosomes.
- The absence of a Y chromosome in both cases results in the female sex.
Therefore, XO and XY types of sex determination are examples of male heterogamety, where the male sex is determined by the presence of a specific sex chromosome, namely the Y chromosome.
Explanation:
In sex determination, organisms can possess different systems. Two common systems of sex determination are XO and XY.
1. XO type of sex determination:
- In this system, females have two X chromosomes (XX), while males have only one X chromosome (XO).
- The presence of the Y chromosome determines the male sex, while the absence of the Y chromosome results in the female sex.
- Examples of organisms with XO sex determination include certain insects, such as grasshoppers and crickets.
2. XY type of sex determination:
- In this system, females have two X chromosomes (XX), while males have one X and one Y chromosome (XY).
- The presence of the Y chromosome determines the male sex, while the absence of the Y chromosome results in the female sex.
- Examples of organisms with XY sex determination include mammals, including humans.
Comparison:
- In both XO and XY sex determination, the male sex is determined by the presence of the Y chromosome.
- The key difference lies in the number of sex chromosomes present in females. In XO sex determination, females have two X chromosomes, while in XY sex determination, females also have two X chromosomes.
- The absence of a Y chromosome in both cases results in the female sex.
Therefore, XO and XY types of sex determination are examples of male heterogamety, where the male sex is determined by the presence of a specific sex chromosome, namely the Y chromosome.
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XO type of sex determination and XY type of sex determination are the examples ofa)male heterogametyb)female heterogametyc)male homogametyd)both (b) and (c)Correct answer is option 'A'. Can you explain this answer?
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