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peroxisomes and glyoxysomescertain small ovoid unit membrane bound sac like cytoplasmic organelles resembling lysosomes in
lysosomeslike mitochondrial lysosomes are also typical membrane bound and dense fluid filled sac like cytoplasmic organelles of
mitochondria singular- mitochondrionthese are conspicuous hollow sac liked cell organelles found in all eukaryotic cells
vacuoles some animals cells may have one to a few small fluid filled vacuoles plants cells in general possess one or a
golgi complex golgi apparatus golgi bodythe nobel laureate camilla golgi 1898 discovered the presence of a special small
endoplasmic reticulumbulk of the cytoplasmic compartment of a cell is occupied by complex continuous channel system in the form a
cytoplasmic matrix cytosol or hyaloplasm this is the actual protoplasmic part of the cytoplasm containing dissolved proteins electrolytes
cell membraneas discrete units of life all living cells are separated from each other and from their external environment by an extremely
water is most dense and thus heavier at 4 degreese celceus at 0 degreese celceus ice forms and can float on liquid water assuming that ice were most
blastulation formation of blastula from morula is called as blastulationduring early cleavage the blastomere maintain spherical shape and mulberry
types of cleavage -depending upon the distribution amp amount of yolk cleavage is of following types -1 holoblastic equal
plane of cleavage -each cleavage of the division zygote is marked by a cleavage furrowusually the first cleavage furrow is vertical amp passes
chemical changes during cleavage -1 synthesis of dna occurs2 synthesis of rna rrna is absent mrna amp
laws of cleavage -1 sacs law - according this law during cleavage each blastomere to form similar blastomere new cleavae always take place at the
characterstics of cleavage -in cleavage involve the series of mitotic division so daughter cells are genetically similar to the parental cellthe
introduction -karl von baer - coined the term cleavage swammerdom - first time seen cleavageprevost and dumas - reported cleavage of frogs egg
parthenogenesisthe development of egg to form an animal without fertilization is called as parthnogenesisparthenogenesis was discovered by charles
significance of fertilization -1 in fertilization process number of chromosome are diploid in zygote2 during
errors in fertilization -1 polyspermy - when more than one sperms are fused in an ovum this condition is called
types of fertilization -on the basis of site of fertilization it is of two types - 1 external fertilization 2 internal
introduction -fertilization is a complex process which involves fusion of male amp female gametesthe male gamete in animals is called as sperm amp
difference between spermatogenesis and oogenesis -snospermatogenesisoogenesis1 2 3 4 5 6 7 8 9 10it take place in
eggs of eutheriathis egg is small amp round the dimeter of human egg is 01 mmit has very little amount of yolk but they are also as alecithal eggthe
eggs of frogthis egg is round amp its diameter is of 1-2 mmit is mesolecithal amp has distinct animal pole amp vegital polethe nucleus is found in
eggs of insectthis eggs is centrolecithal and it is elliptical it diameter is 2-3 mmit has two eggs membrane ie vitelline membrane and chitinous