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Tutorial01 (1) - Tutorial#1 by Ma'ayan Fishelson Changes...

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Tutorial #1 by Ma’ayan Fishelson Changes made by Anna Tzemach
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2 Genetic Information Gene  – basic unit of genetic information.  Genes determine the inherited characters. Genome  – the collection of genetic  information. Chromosomes  – storage units of genes. DNA DNA  -  is a nucleic acid that contains the  genetic instructions specifying the biological  development of all cellular forms of life 
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3 Chromosome Logical Structure Locus  – location of a gene/marker on the  chromosome. Allele  – one variant form of a gene/marker  at a particular locus. Locus1 Possible Alleles: A1,A2 Locus2 Possible Alleles: B1,B2,B3
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4 Human Genome Most human cells  contain 46 chromosomes: sex chromosomes  (X,Y): XY – in males. XX – in females. 22 pairs of chromosomes named  autosomes .
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5 Genotypes Phenotypes At each locus (except for sex chromosomes) there are 2 genes.   These constitute the individual’s  genotype  at the locus. The expression of a genotype is termed a  phenotype . For  example, hair color, weight, or the presence or absence of a  disease. 
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6 Genotypes Phenotypes (example) E b dominant  allele. E w recessive  allele. genotypes phenotypes
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7 Dominant vs. Recessive   dominant  allele is  expressed even if it is paired  with a recessive allele. recessive  allele is only  visible when paired with  another recessive allele.
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8 One Locus Inheritance heterozygote homozygote 2 1 A | A a | a A | a 3 4 a | a A | a 5 6 a | a Male Female
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9 Two members of a gene pair segregate from each other into  the gametes, so half the gametes carry one member of the  pair and the other half carry the other member of the pair. Two members of a gene pair segregate from each other into  the gametes, so half the gametes carry one member of the  pair and the other half carry the other member of the pair.
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