ANEUPLOIDY
NULLISOMIC—- An aneuploid lacking a pair of homologous chromosome.2n -2
GENETIC DISEASES IN HUMAN
ALBINISM -Caused by absence of enzyme tyrosinase which convert dihydroxyphenylalanine into melanin. Only homozygous individuals are effected.
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GENETIC DISEASES
ALKAPTONURIA — Inborn metabolic defect by single gene
PHENYLKETONURIA—-Recessive inherited disease Homozygous individual are affected while heterozygous are carrier.The child is born normal but within 6 months he develops the symptoms.
MITOSIS IN ANIMAL AND PLANT CELL
The chromosome appear as a long thin threads in the form of ball hence named spireme stage.
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QUIZ ON CELL CYCLE AND CELL DIVISION 2AUGUST2024
Flemming coined the term mitosis.
Farmer & Moore coined the term Meiosis
Cell cycle was described by Howard & Pele
Amitosis was first discovered by Remark in RBC of chick embryo.
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GENETIC DISEASES
Haemophilia–It is a sex linked disease caused by recessive gene present on X chromosomes
CELL CYCLE AND CELL DIVISION
QUIESCENT STAGE :Some cell do not enter G₁ phase after mitosis and start differentiation into specific type of cells Such cells are said to be in Quiescent stage or G₀ PHASE .These cells start division only when required.
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CHROMATIN
HETEROCHROMATIN : After cell division some chromatin fibre remain coiled & compact which stain deeply it lie close to the nuclear lamina