NCERT Solution for Class 10 Science Chapter 9
Heredity and Evolution
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-143
Questions No-1
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?
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In asexual reproduction, the reproducing cells produce a copy of their DNA through some
chemical reactions. However, this copying of DNA is not accurate and therefore, the newly
formed DNA has some variations.
It can be easily observed in the above figure that in asexual reproduction, very few
variations are allowed. Therefore, if a trait is present in only 10% of the population, it is
more likely that the trait has arisen recently. Hence, it can be concluded that trait B that
exists in 60% of the same population has arisen earlier than trait A.
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Trait B appears to own arisen earlier because it is gift in larger fraction of the population. Since agenesis maintain the attribute within the population and make the relation with identical traits as gift in the oldsters.
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, trait B is likely to have arisen earlier because this trait has been replicating and existing in a higher percentage of the population as compared to trait A.
Trait B is likely to have arisen earlier because this trait has been replicating and existing in a higher percentage of the population as compared to trait A.
Trait B is likely to have arisen earlier because it exist in a higher percentage of the population as compared to trait A.
Trait B is likely to have arisen earlier because it is present in a larger portion of the population.
The prevalence of a trait in a population does not necessarily indicate the time of its origin. The frequencies of traits in a population can be influenced by various factors, including selective pressures, genetic mutations, and the environment. Therefore, the fact that trait A exists in 10% of the population and trait B exists in 60% of the population does not provide information about the relative ages of these traits.
The emergence of traits in a population is a complex process influenced by genetic variation, natural selection, and other evolutionary factors. The frequency of a trait in a population can change over time due to these factors.
To determine the relative age of traits, scientists often use genetic and molecular evidence to trace the evolutionary history of specific traits. Genetic studies, including molecular phylogenetics, can provide insights into the evolutionary relationships among different traits and their origins.
In summary, without additional information about the genetic or molecular history of traits A and B, their current prevalence in the population does not indicate which trait arose earlier.