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Slide 1 - Variation and the Monohybrid Cross Higher Biology
Slide 2 - 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”
Slide 3 - 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
Slide 4 - ppt slide no 4 content not found
Slide 5 - 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
Slide 6 - 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
Slide 7 - ppt slide no 7 content not found
Slide 8 - Importance of Variation Helps species adapt to a changing environment ‘Survival of the fittest’ then occurs as a result of natural selection
Slide 9 - 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
Slide 10 - 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
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Slide 12 - Incomplete dominance
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