The alleles of bloodtypes are: IA, IB and IO.

Sex inheritance depends on the presence of X and Y chromosomes.The function of DNA is to control cell function by controlling the production of proteins i.e. Using microorganism in making yoghurt and single cell protein Combination of these alleles can therefore results in blood groups A, B, AB, and O. Passage of water through root, stem and leaf Effect of Carbon Dioxide on the Rate of Photosynthesis This particular number is extremely important for normal bodily function. Introduction Genetics is the study of inheritance.

Factors that determine characters (genes) are passed on from parent to offspring through gametes or sex cells. Genes are specific sequences of nucleotides that code for particular proteins. Effect of exercise on heartbeat and causes of a coronary heart disease Notes for the CIE IGCSE Biology topic: 17. Distribution of Xylem and Phloem in roots, stems and leaves Email This BlogThis! Sickle cell anaemia. The ratio of blue:brown is 1:3 Co-dominance is when a pair of alleles are neither dominant to one another. The code within that length is ATTCGAA. Here are some key definitions that you must be aware of: If this cell were to simply divide in half, then it the resulting cells will only have 23 chromosomes. Other Nutrients: Vitamins, Minerals, Fiber and Water Problems of world food supplies and the causes of famine enzymes, antibodies, cell receptors, etc. 1 comment: seema January 5, 2017 at 6:34 PM. One allele for this gene may code for brown eyes, whereas another allele may code for blue eyes. Translocation of applied chemicals throughout the plant There are variations in this gene called alleles. Genetic information is stored in the the form of DNA within the cell nucleus. Let us consider a particular gene (gene A) that makes a certain protein (protein A). All body cells contain the same genes, but not all genes are expressed because the cell only makes certain proteins that it really needs.

Gametes i.e. The sequence of bases along a particular length of a DNA strand codes for the manufacture of a specific protein.

One of the pairs of chromosomes codes for sex inheritance. This is very important for various bodily functions: Imagine diploid cell A (46 chromosomes) undergoing mitosis. at 11:21 PM. Use of modern technology for increasing food production Arteries, veins and capillaries - structure and functions Cells like this are called diploid cells, and are majority of the cells in the human body. Mitosis is the nuclear division giving rise to genetically identical cells. Use of microorganisms and fermenter to manufacture enzymes The fact that the offspring of any species resemble the parents indicates that the characters in the parents are passed on to the offspring. The colour deficient gene is an abnormal gene found in the X chromosome (Xc). These have been made according to the specification and cover all the relevant topics in the syllabus for examination in May/June as well as October/November and March.

He first demonstrated the inheritance of traits in pea plants and later it was referred to as a Mendelian inheritance. Therefore, the cell duplicate its chromosomes before mitosis occurs (i.e. Meiosis is a type of nuclear division giving rise to cells that are genetically different. sperm cells/egg cells, have only a single set of 23 chromosomes. 11. Selection naturale and artificial. The DNA is made of a double helix backbone, which are connected by pairs of bases. Main nutrients: carbohydrates, fats and proteins Optimum conditions for photosynthesis in Green house Mutation, radiation. Use of microorganisms to manufacture antibiotic penicillin This base sequence codes for which amino acids should be joined in what order, to build a particular protein. This is because females have two X chromosomes (XX).The normal colour vision allele dominates the abnormal allele, so as long as the female has one normal X chromosome then they will have good colour vision.

Absorption – function of the small intestine and significance of villi 8. Example 1 – Homozygous recessive (bb) X Heterozygous(Bb)Example 2 – Homozygous recessive (bb) vs Homozygous dominant (Bb) Through the processes of meiosis and sexual reproduction, genes are transmitted from one generation to the next. When organisms reproduce, all the information for growth, survival, and reproduction for the next generation is found in the DNA passed down from the parent generation. Genetic inheritance occurs due to genetic material in the form of DNA being passed from parents to their offspring. Food additives - uses, benefits and health hazards Transport of materials from sources to sinks at different seasons Share to Twitter Share to Facebook Share to Pinterest.

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