Variation and the monohybrid cross l.jpg
This presentation is the property of its rightful owner.
Sponsored Links
1 / 13

Variation and the Monohybrid Cross PowerPoint PPT Presentation


  • 76 Views
  • Uploaded on
  • Presentation posted in: General

Variation and the Monohybrid Cross. Higher Biology. Significance of meiosis. Allele: different forms of the same gene ‘Meiosis provides the opportunity for new combinations of the existing alleles of genes to arise”. Independent assortment of chromosomes.

Download Presentation

Variation and the Monohybrid Cross

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Variation and the monohybrid cross l.jpg

Variation and the Monohybrid Cross

Higher Biology


Significance of meiosis l.jpg

Significance of meiosis

Allele:different forms of the same gene

‘Meiosis provides the opportunity for new combinations of the existing alleles of genes to arise”


Independent assortment of chromosomes l.jpg

Independent assortment of chromosomes

  • Homologous pairs line up at equator during first meiotic division

  • Final position of any one pair is random relative to any other

  • Second meiotic division brings about independent assortment of chromosomes

  • This may lead to new phenotypes in the next generation


Crossing over and separation of linked genes l.jpg

Crossing over and separation of linked genes

  • Chromosome is aligned with its homologous partner during first meiotic division

  • Portions of chromatid exchanged at points called chiasmata


Chiasmata l.jpg

Chiasmata

  • Chromatids become broken

  • Broken end of one joins with that of another

  • Alleles of linked genes can become separated

  • Formation of new allele combinations

  • Formation of new phenotypes


Importance of variation l.jpg

Importance of Variation

  • Helps species adapt to a changing environment

  • ‘Survival of the fittest’ then occurs as a result of natural selection


Monohybrid cross l.jpg

Monohybrid Cross

  • Cross between true-breeding parents with different alleles of the same gene

  • Genotype:the alleles the individual possesses of a particular gene

  • Phenotype:physical appearance of an individual


Mendel s first law l.jpg

Mendel’s First Law

  • The principle of segregation

  • alleles of a gene exist in pairs

  • when gametes form

    • members of each pair pass into different gametes

    • each gamete contains only one allele of each gene


Incomplete dominance l.jpg

Incomplete dominance


Slide13 l.jpg

This powerpoint was kindly donated to www.worldofteaching.com

http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.


  • Login