In a population of an asexually reproducing species, if trait A exists in 10% and trait B in 60%, it is likely that trait B arose earlier. This is because a higher percentage of the population exhibiting trait B suggests that it has been present for a longer time, allowing it to spread more extensively within the population compared to the less common trait A.

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Understanding Trait Prevalence in Asexual Reproduction

In the context of asexually reproducing species, understanding the prevalence of certain traits within a population can provide insights into their evolutionary history. Asexual reproduction, characterized by the absence of genetic mixing that occurs in sexual reproduction, offers a unique perspective on how traits are passed down and become prevalent in a population.

The Prevalence of Traits A and B

Consider a hypothetical scenario where, in a given population, trait A is present in 10% of individuals, while trait B is found in 60%. This significant difference in prevalence can be indicative of several evolutionary and genetic factors. In asexual reproduction, where offspring are genetically identical to the parent, the spread of a trait is directly linked to the reproductive success of individuals possessing that trait.

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The Implication of Higher Prevalence

The higher prevalence of trait B (60%) suggests that it has been part of the population’s genetic makeup for a longer period compared to trait A, which is only present in 10% of the population. This is because, over time, traits that appear earlier are more likely to spread throughout the population, especially if they confer some advantage or are neutral in terms of survival and reproduction.

Evolutionary Time Scale and Trait Emergence

The emergence of traits in a population is often a gradual process influenced by various factors, including environmental pressures and random genetic mutations. In asexual organisms, once a beneficial or neutral mutation arises, it can quickly become widespread in the population, as each offspring is a clone of its parent. Therefore, the widespread presence of trait B implies that it likely emerged earlier than trait A.

Conclusion: Assessing Trait Arising

In conclusion, in an asexually reproducing population, the prevalence of a trait can be a key indicator of its emergence in the evolutionary timeline. Given the data, trait B, with its higher prevalence, likely arose earlier than trait A. This analysis assumes that other factors like genetic drift or sudden environmental changes did not disproportionately influence the prevalence of these traits.

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Questions of 10th Science Chapter 8 in Detail

If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?
How does the creation of variations in a species promote survival?
How do Mendel’s experiments show that traits may be dominant or recessive?
How do Mendel’s experiments show that traits are inherited independently?
A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?
How is the sex of the child determined in human beings?
A study found that children with light-coloured eyes are likely to have parents with light-coloured eyes. On this basis, can we say anything about whether the light eye colour trait is dominant or recessive? Why or why not?
Outline a project which aims to find the dominant coat colour in dogs.
How is the equal genetic contribution of male and female parents ensured in the progeny?