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VARIATION (CAUSED BY mutations (change the sequence of genetic material)…
VARIATION
CAUSED BY mutations (change the sequence of genetic material)
CAUSED BY MUTAGENS(AGENTS): Radiation
UV light
X-ray
drugs
chemical benzene(fo-maldehyde)
pH level
Overheat
TYPES
CHANGE THE CHROMOSOME NUMBER (non-disjunction)
ex: down syndrome
turner
klinefelter
CHANGE IN CHROMOSOME STRUCTURE:
POINT MUTATION (change the nucleotide sequence of DNA or gene)
IF
SEXUAL REPRODUCTION OBSERVD IN:
somatic cell
-affect the human itself
sex cell
-affect next generation
ASEXUAL REPRODUCTION-affect next generation
MOST OF
HARMFUL
-cause die called
lettial mutation
(öldürücü)
SOME OF
BENEFICIAL AFFECT/POSITIVE
enables -environmental stress and adapt to environmental changes
GENETİC RECOMBINANT
fertilization
independent assortment
random distribution &seperation of homologous and sister chromatids(meiosis)
crossing over
CONJUGATION
in bacteria and paramecium
ENVİRONMENTAL FACTORS
phenotypical change(physical appearence)
pH level(change color of flowers)
temperature(change color of flowers)
nutrition(change height)