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


1
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.

3
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.

4
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.

5
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.

6
Heredity and Evolution Part II Sex
DeterminationClass 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.
  • Preparing for Board Exams and want to score highe
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