Heredity and Evolution Part – II – Sex Determination|Class 10 Science Notes - PowerPoint PPT Presentation
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Heredity and Evolution Part – II – Sex Determination|Class 10 Science Notes
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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 – PowerPoint PPT presentation
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Title: Heredity and Evolution Part – II – Sex Determination|Class 10 Science Notes
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Heredity and Evolution Part II Sex
DeterminationClass 10 Science Notes
2
Heredity and Evolution Part II Sex
DeterminationClass 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.
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Heredity and Evolution Part II Sex
DeterminationClass 10 Science Notes
- XX- Female chromosome
- XY- Male chromosome
- The human gender can be determined by the pair of
the chromosome called a sex chromosome. - 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.
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Heredity and Evolution Part II Sex
DeterminationClass 10 Science Notes
- 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.
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Heredity and Evolution Part II Sex
DeterminationClass 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.
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Heredity and Evolution Part II Sex
DeterminationClass 10 Science Notes
- Make your learning interesting and longlasting
with animated learning videos for 10th
Class Science , register with us to know more. - 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. - Preparing for Board Exams and want to score highe
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