variation and the monohybrid cross
Download
Skip this Video
Download Presentation
Variation and the Monohybrid Cross

Loading in 2 Seconds...

play fullscreen
1 / 13

Variation and the Monohybrid Cross - PowerPoint PPT Presentation


  • 113 Views
  • Uploaded on

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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Variation and the Monohybrid Cross' - tamarr


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
significance of meiosis
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
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
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
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
Importance of Variation
  • Helps species adapt to a changing environment
  • ‘Survival of the fittest’ then occurs as a result of natural selection
monohybrid cross
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
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
slide13

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.

ad