Microsoft PowerPoint - Genetic Engineering - GENETIC...

Microsoft PowerPoint - Genetic Engineering
Download Document
Showing pages : 1 - 10 of 20
This preview has blurred sections. Sign up to view the full version! View Full Document
Background image of page 1
Role of Mutation Change in structure or amount of an organism’s genetic material Change in genotype produces change in phenotype = mutant 2 types of mutation . ۱ Chromosome mutation . ۲ Change in structure of one chromosome
Background image of page 2
Chromosome mutations Change in chromosome number . ۱ Non-disjunction in meiosis . ۲ Non-disjunction of sex chromosomes . ۳ Complete non-disjunction and polyploidy
Background image of page 3
Non-disjunction during meiosis Spindle fibre fails during meiosis Members of one pair of homologous chromosomes fail to become separated 2 gametes receive extra copy of affected chromosome 2 gametes lack that chromosome
Background image of page 4
Background image of page 5
Down’s Syndrome r Non-disjunction in chromosome 21 r Occurs in human egg mother cell r One or more abnormal eggs formed (n = 24) r Fertilised by normal sperm (n = 23) r Formation of abnormal zygote (2n = 47)
Background image of page 6
Background image of page 7
Background image of page 8
Background image of page 9
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.
Ask a homework question - tutors are online