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Heredity and Evolution Part- II – Sex Determination|Class 10 Science Notes

Heredity and Evolution Part – II – Sex Determination|Class 10 Science Notes

We have already discussed the previous article on Chapter – 9
What are Heredity and Evolution? from class 10 science, but in this article, we will discuss the topic of Sex Determination.

Factors considered determining Sex

1 Environmental Fact

In some animals, the temperature at which eggs are fertilized determined the gender.

2 Genetic

In some animals class 10 science Heredity and evolution Part II

Sex chromosome

In human beings, there are 23 pairs of chromosome. Out of these 22 chromosome pairs are called autosomes and the last pair of the chromosome that help in deciding the gender of that individual is called the sex chromosome.

XX- Female chromosome

XY- Male chromosome

The human gender can be determined by the pair of the chromosome called a sex chromosome.

Heredity and Evolution Part II - Sex Determination|Class 10 Science Notes

Check another notes on NCERT Class 10 Science What is Family Planning and Birth Control?

Evolution

It is the sequence of gradual changes taking place in the primitive organism, over millions of years in which new species are produced.

Acquired Trait

These are traits which are developed in an individual due to special conditions. It cannot be transferred to the progeny and it cannot divert evolution. Eg low weight of starving beetles.

Inherited traits

These are traits which are passed from one generation to the next. It gets transferred to progeny and it helps in evolution. Eg color of eyes and hair.

Speciation ways

Gene flow

It occurs between a population that is partly but nor completely separated.

Genetic drift

It is the random change in the frequency of alleles in a population over successive generations.

Natural selection

The process by which nature selects and consolidates that organism which is more suitable adapted and possesses favorable variations.

Geographical isolation

It is caused by mountain ranges, rivers etc.

Heredity and Evolution Part II - Sex Determination|Class 10 Science Notes

Evolution and classification

Evolution and classification are interlinks

Classification of species is the reflection of their evolutionary relationship. The more characteristics two species have in common the more closely they are related. The more closely they are related, the more recently they have a common sensor. Similarities among organisms allow us to group them together and to study their characteristics.

Heredity and Evolution Part II - Sex Determination|Class 10 Science Notes

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Evidence of evolution

Homogenous organs

These are organs that have basic structural plan and origin but different functions. Example winds of the bat, the paw of a cat

Analogous organ

These are organs that have different origin and structural plan but same function. Example- wings of bat have elongated fingers with skin folds.

Get NCERT Solutions of Heredity and Evolution of Class 10 Science  Click here to know more.

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Heredity and Evolution Part II - Sex Determination|Class 10 Science Notes

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Tag- Heredity and Evolution part-ii, Class 10 science, Sex Determination, Evolution and classification, 10th Class Science, NCERT Solutions for Class 10

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