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Dr. Sinan Bahjat MBCh.B., M.Sc., FIBMSL1
Dr. Sinan Bahjat MBCh.B., M.Sc., FIBMSL1

... A gene can exist in more than one form.  Organisms inherit two alleles for each trait.  When gametes are produced (by meiosis), allele pairs separate leaving each cell with a single allele for each trait.  When the two alleles of a pair are different, one is dominant and the other is recessive. ...
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Concept 20.1 A. -Plasmid is the cloning vector.

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Genetics and Heredity

... or physical traits are controlled by factors or genes that occur in pairs  Genes (segments of DNA) are found in cells and responsible for inherited features  Genes are located on chromosomes  Most organisms have homologous pairs of chromosomes or one set from each parent ...
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... • The genes are inherit from both parents but the offspring’s phenotype is determined not by its own phenotype but by the genotype of the mother. • The substances present in the cytoplasm of an egg are pivotal in early development. Example: shell coiling of the snail Limnaea peregra. ...
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... • Could be in charge of making a protein (like the gene for the molecule keratin has its nucleotides in an order such that the amino acid sequence that is made from those directions will make keratin) • Could be a ‘regulatory’ gene – like a foreman in a factory who produces nothing directly, but who ...
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Epigenetics of human development

Development before birth, including gametogenesis, embryogenesis, and fetal development, is the process of body development from the gametes are formed to eventually combine into a zygote to when the fully developed organism exits the uterus. Epigenetic processes are vital to fetal development due to the need to differentiate from a single cell to a variety of cell types that are arranged in such a way to produce cohesive tissues, organs, and systems.Epigenetic modifications such as methylation of CpGs (a dinucleotide composed of a 2'-deoxycytosine and a 2' deoxyguanosine) and histone tail modifications allow activation or repression of certain genes within a cell, in order to create cell memory either in favor of using a gene or not using a gene. These modifications can either originate from the parental DNA, or can be added to the gene by various proteins and can contribute to differentiation. Processes that alter the epigenetic profile of a gene include production of activating or repressing protein complexes, usage of non-coding RNAs to guide proteins capable of modification, and the proliferation of a signal by having protein complexes attract either another protein complex or more DNA in order to modify other locations in the gene.
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