Genetics Primer SBI 4 UI Mrs Tuma S

Genetics Primer: SBI 4 UI Mrs. Tuma S

Test Your Genetic IQ: 1. The Human Genome contains 3 billion base pairs. True or False?

Test Your Genetic IQ: 2. The human genome contains about 100 000 genes. True or False

Test Your Genetic IQ: 2. The human genome contains about 100 000 genes. True or False (It probably has about 15 000 - 20 000 genes. )

Test Your Genetic IQ: 3. There are twice as many mutations in sperm versus ova. True or False

Test Your Genetic IQ: 3. There are twice as many mutations in sperm versus ova. True (ratio is 2: 1) or False

Test Your Genetic IQ: 4. Your genes can be affected by past events and exposures of your ancestors. True/False

Test Your Genetic IQ: 4. Your genes can be affected by past events and exposures of your ancestors. True (epigenetics) /False

Test Your Genetics IQ: 5. Your genes have an impact on how certain therapeutic drugs may affect you. True / False

Some Basic Terms: DNA : deoxyribonucleic acid -- what our inherited material is made of -- in nucleus and mitochondrion RNA: ribonucleic acid – a close copy of DNA

Some Basic Terms: Gene: DNA sequence coding for particular characteristic Allele: 2 different forms of the same gene Homozygous: two of the same allele eg: AA or aa Heterozygous: two different alleles e. g. : Aa

Some Basic Terms: Dominant: when allele is present it is always expressed Recessive: need 2 copies of allele for the trait – masked by dominant

Some Basic Terms: Autosome: non-sex chromosomes (pairs 1 -22) Sex chromosome: 23 rd pair of chromosomes XX or XY

Some Basic Terms:

Some Basic Terms: Chromatin: fibres of DNA that make up chromosomes Chromosome: strands of nucleic acids and histone proteins Chromatid: individual chromosome strand

The End!