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Which type of sex determination results in more balanced sex ratios?

Option: 1

Genetic sex determination 


Option: 2

Temperature-dependent sex determination


Option: 3

 Environmental sex determination.

 


Option: 4

Hormone-dependent sex determination


Answers (1)

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Genetic sex determination, in which sex is determined by the combination of sex chromosomes, generally results in more balanced sex ratios. This is because the ratio of male to female offspring is determined by the probability of inheriting a specific combination of sex chromosomes.

 

In genetic sex determination, such as in mammals (XY in males, XX in females) or in some insects (X0 in males, XX in females), there is a 50% chance of producing male offspring and a 50% chance of producing female offspring. This leads to a relatively balanced sex ratio in a population over time.

 

In contrast, other methods of sex determination can result in skewed sex ratios. For example, temperature-dependent sex determination (TSD) in some reptiles can be influenced by specific temperature ranges, leading to deviations from a 1:1 sex ratio. Environmental sex determination, where sex is determined by environmental factors beyond temperature, can also result in skewed ratios depending on the prevailing conditions. Similarly, hormone-dependent sex determination can be influenced by hormonal imbalances or environmental factors, leading to imbalanced sex ratios.

Thus, genetic sex determination tends to produce more balanced sex ratios compared to other mechanisms.

Option 1 is the correct answer.

Posted by

Devendra Khairwa

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