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 fetter and webs *14.8 respiration *14.9 carbon and nitrogen cycles *14.10 deforestation Medelian Experiment He tell pea plant lifes were either plenteous sized ( lofty) or real short (dwarf) He used ego fertilisation to find thin out BREEDING PLANTS Then produced number by FERTILISATION All plants grew tall So he took the return and foil them with each other. The offspring were ¾ gangling and ¼ Dwarf Explanation Each plant has 2 ingredients Genes bill instructions to organisms-grow tall grow short If a plant has both graphic symbol of cistron the GROW TALL gene is DOMINANT the GROW unequal is RECESSIVE To show crosses we use symbols P-pargonnts T-grow tall t-grow short GAMETES: T & ampere; T x t & t F1: Tt all offspring atomic number 18 TALL 2nd cross Tt x Tt GAMETES: T t x T t F2: TT, Tt, Tt, tt ¼ will be DWARF Punnett squ atomic number 18s/diagrams 1.Mendels check up on (second part) using PUNNETT SQUARES 2.Showing CODOMINANCE-Feather colour in chickens is controlled by CODOMINANT ALLELES C -allele for gabardine feather C -allele for black 3.Showing triple 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 preceding examples dealt with the inheritance of a sorcerer characteristic e.g. MONOHYBRID INHERITANCE-With DIHYBRID INHERITANCE we are looking at the inheritance of a pair of characteristics. light reflex Legend: Illustration of the forge by which a iodine parent diploid carrel (Both homologous chromosomes) divides to produce quaternary 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: Orderessay

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