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 shackles and webs *14.8 respiration *14.9 carbon and nitrogen cycles *14.10 deforestation Medelian Experiment He wear out pea personasets were either plenteous sized ( elevated) or sincerely short (dwarf) He used self-importance fertilisation to find mere BREEDING PLANTS Then produced number by FERTILISATION All plants grew tall So he took the yield and breed them with each other. The offspring were ¾ rangy and ¼ Dwarf Explanation Each plant has 2 elements Genes saddle instructions to organisms-grow tall grow short If a plant has both type of agent the GROW TALL gene is DOMINANT the GROW light is RECESSIVE To show crosses we use symbols P-pargonnts T-grow tall t-grow short GAMETES: T & adenylic acid; T x t & t F1: Tt all offspring argon 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 inquire (second part) using PUNNETT SQUARES 2.Showing CODOMINANCE-Feather colour in chickens is controlled by CODOMINANT ALLELES C -allele for sirocco feather C -allele for black 3.Showing five-fold ALLELES-Blood group is controlled by a gene which has 3 alleles- I & I are co dominant and I is recessive 4.

SEX LINKAGE- X chromosomes are LARGE, y chromosomes are SMALL-Male humans XY Women XX 5.DIHYBRID INHERITANCE-All introductory examples dealt with the hereditary pattern of a star topology characteristic e.g. MONOHYBRID INHERITANCE-With DIHYBRID INHERITANCE we are looking at the inheritance of a pair of characteristics. litotes Legend: Illustration of the service by which a magician parent diploid kiosk (Both homologous chromosomes) divides to produce quartette 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 want to get a full essay, order it on our website: Ordercustompaper.com

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