Biology Revision.

*14.1 meiosis, Medelian heritage *14.2 variation *14.3 population divisortics *14.4 classification *14.5 ecosystems *14.6 photosynthesis *14.7 food custody and webs *14.8 respiration *14.9 carbon and nitrogen cycles *14.10 deforestation Medelian Experiment He discover pea plants were either full sized (t every(prenominal)) or really short (dwarf) He used self bandaging to find sheer BREEDING PLANTS Then make waterd number by FERTILISATION All plants grew tall So he took the youth and traverse them with each other. The offspring were ¾ Tall and ¼ Dwarf description Each plant has 2 genes Genes institutionalize instructions to organisms-grow tall grow short If a plant has both type of gene the GROW elevated gene is DOMINANT the GROW inadequate is RECESSIVE To verbalize crosses we use symbols P-pargonnts T-grow tall t-grow short GAMETES: T & T x t & t F1: Tt all offspring are TALL 2nd cross Tt x Tt GAMETES: T t x T t F2: TT, Tt, Tt, tt ¼ will be DWARF Punnett squares/diagrams 1.Mendels check out (second part) using PUNNETT SQUARES 2.Showing CODOMINANCE-Feather colour in chickens is controlled by CODOMINANT ALLELES C -allele for gaberdine feather C -allele for black 3.Showing MULTIPLE ALLELES-Blood group is controlled by a gene which has 3 alleles- I & I are co dominant and I is recessive 4.

put forward LINKAGE- X chromosomes are LARGE, y chromosomes are SMALL-Male humans XY Women XX 5.DIHYBRID heritage-All previous examples dealt with the inheritance of a maven characteristic e.g. MONOHYBRID INHERITANCE-With DIHYBRID INHERITANCE we are looking at the inheritance of a span of characteristics. Meiosis Legend: Illustra! tion of the process by which a ace parent diploid booth (Both homologous chromosomes) divides to produce quatern daughter haploids cells (One homologous chromosome of the pair). Meiosis is the type of cell division by which germ cells (eggs and sperm) are produced. Meiosis involves a... If you call for to get a full essay, order it on our website: BestEssayCheap.com

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