IGCSE BIOLOGY REVISION [Syllabus 17] - Monohybrid Inheritance 

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Personal notes - Alleles are different versions of the same gene - Genotype is the genetic make-up of organisms whereas phenotype are the characteristics that are visible in that organism e.g. a person can have alleles for both brown and blue eyes but the color will visible will be - Organisms can be homozygous or heterozygous - Alleles can be either recessive or dominant - Punnet squares: 1) parents - BB and bb, offspring Bb 100% chance 2) parents - Bb and bb, offspring Bb or bb 50% chance - Co dominance: A pair of alleles neither of which are dominant to the other so they both have impact on the phenotype

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I am doing BTEC level 2 science instead of GCSE but were doing this topic. i find genetic hard maybe because theres so many terms. but love this so much you explain it so clearly

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i have a question if there is a flower that has dominant white alleles(W) and dominant red allele(R) the plant shows co-dominance what will be the colour of RW The mark scheme says pink but isn't is supposed to be a flower with equal white and red patches

Thank you

@ 7:59 So the abnormal allele is recessive while the normal allele is dominant? And is this always the case?

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at 4:23 the punette squre is incorrect

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Thank u

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At 4:34 isnt the Bb supposed to b brown eyed u showed it as blue??

4:32 its bb not Bb

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