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? - Science

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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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Solution 1

Trait B because in asexual reproduction traits which are present in the previous generation are carried over to next generation with minimal variations. Trait B have higher percentage so it is likeliy to have arisen earlier.

Solution 2

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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Chapter 4: Heredity and Evolution - Exercise 1 [Page 191]

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Lakhmir Singh Class 10 Biology (Science)
Chapter 4 Heredity and Evolution
Exercise 1 | Q 4 | Page 191
NCERT Science Class 10
Chapter 9 Heredity and Evolution
Intext Questions | Q 1 | Page 143

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