Variation and the Monohybrid Cross

Variation and the Monohybrid Cross - Helps species adapt to...

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Variation and the Monohybrid Cross Higher Biology
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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”
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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 
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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
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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
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Importance of Variation
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Unformatted text preview: Helps species adapt to a changing environment Survival of the fittest then occurs as a result of natural selection 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 Mendels 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 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....
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Variation and the Monohybrid Cross - Helps species adapt to...

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