3 1 Genes Genes and hence genetic information

3. 1 Genes • Genes and hence genetic information is inherited from parents, but the combination of genes inherited from parents by each offspring will be different. In sexual reproduction each parent can only pass on 50% of there genes as the other 50% comes from the second parent. http: //www. nature. com/scitable/content/ne 0000/ne 0000/5 6538/shaw_family_FULL. jpg http: //publications. nigms. nih. gov/insidethecell/images/ch 4_meiosissex. jpg

3. 1 Genes • Essential idea: Every living organism inherits a blueprint for life from its parents.

• Genetics is the study of inheritance and the variation of inherited characteristics. • The traits we inherit are controlled by our chromosomes. • Chromosomes are made of chromatin (DNA wrapped around protein called histone) What do we call the process where chromatin shortens and thickens to form chromosomes? Supercoiling

3. 1. U 1 A gene is a heritable factor that consists of a length of DNA and influences a specific characteristic. AND 3. 1. U 2 A gene occupies a specific position on a chromosome. AND 3. 1. U 3 The various specific forms of a gene are alleles. AND 3. 1. U 4 Alleles differ from each other by one or only a few bases. A gene is a heritable factor that controls or influences a specific characteristic, consisting of a length of DNA occupying a particular position on a chromosome (locus) http: //learn. genetics. utah. edu/content/m olecules/gene/

3. 1. U 1 A gene is a heritable factor that consists of a length of DNA and influences a specific characteristic. AND 3. 1. U 2 A gene occupies a specific position on a chromosome. AND 3. 1. U 3 The various specific forms of a gene are alleles. AND 3. 1. U 4 Alleles differ from each other by one or only a few bases. A gene is a heritable factor that controls or influences a specific characteristic, consisting of a length of DNA occupying a particular position on a chromosome (locus) t have a u b , s u c e same lo h t t a ds to be n d e n t u e o c f n e e r later on a gene a The sequ f n. o e w c s o n h le e s e u ll s q A bases. A A base se w N e f D a t ase can n b y e b r le ly g n in diffe o s nge to a , differing a r h a c il a im s g y in tion of the s c u n ver a u f c d n n io t a muta structure e h t n [3. 1. A 1] a o t rge impac la a e v a h esized. h t n y s in e prot http: //learn. genetics. utah. edu/content/m olecules/gene/

3. 1. U 3 The various specific forms of a gene are alleles. 3. 1. U 4 Alleles differ from each other by one or only a few bases. • Alternative versions of genes account for variations in inherited characteristics – These alternate versions are called alleles. – An allele is one specific version of a gene, differing from other alleles by one or a few bases only and occupying the same position, called a locus, as other alleles of the gene. Allele for purple flower Locus for flower- Homologous pair color gene of chromosomes Allele for white flower

3. 1. A 2 Comparison of the number of genes in humans with other species. Humans see themselves as being more complex and evolved than other species. Therefore you might well expect to see a larger number of genes in humans than in other Ins organisms. ect It is not just plants such as the grapevine that have large numbers of genes; water fleas are an animal example of an organism with more genes than humans. Ba cte Vir us Pla n Ma m ma t l Bir d riu m Microscopic water flea 31, 000 genes! http: //www. wired. com /2011/02/water-fleahttps: //www. sciencenews. org/sites/default/files/storyone_backstory_2. gif genome/

DNA Supercoiling: https: //youtu. be/AF 2 ww. MRe. Tf 8

3. 1. U 6 The genome is the whole of the genetic information of an organism. AND 3. 1. U 7 The entire base sequence of human genes was sequenced in the Human Genome Project. http: //web. ornl. gov/sci/techresources/Human_Genome/index. shtml The Human Genome* Project (HGP) was an international 13 -year effort, 1990 to 2003. Primary goals were to discover the complete set of human genes and make them accessible for further biological study, and determine the complete sequence of DNA bases in the human genome. http: //www. ncbi. nlm. nih. gov/geno me/guide/human/ https: //www. dnalc. org/view/15477 -The-public. Human-Genome-Project-mapping-the-genomesequencing-and-reassembly-3 D-animation-. html *The genome is the entire genetic material of an organism. It consists of DNA (or RNA in RNA viruses) and includes both the genes and the non-coding sequences.

Nature of Science: Developments in scientific research follow improvements in technology - gene sequencers are used for the sequencing of genes. (1. 8) http: //web. ornl. gov/sci/techresources/Human_Genome/index. shtml “The first methods for sequencing DNA were developed in the mid-1970 s. At that time, scientists could sequence only a few base pairs per year, not nearly enough to sequence a single gene, much less the entire human genome. By the time the HGP began in 1990, only a few laboratories had managed to sequence a mere 100, 000 bases, and the cost of sequencing remained very high. Since then, technological improvements and automation have increased speed and lowered cost to the point where individual genes can be sequenced routinely, and some labs can sequence well over 100 million bases per year. ” (https: //www. genome. gov/10001177)

Nature of Science: Developments in scientific research follow improvements in technology - gene sequencers are used for the sequencing of genes. (1. 8) http: //web. ornl. gov/sci/techresources/Human_Genome/index. shtml Key advances in technology: • Biotechnology techniques such as PCR are used to prepare samples: the DNA needs to be copied to prepare a sufficiently large pure samples to sequence • Computers automate the sequencing process • Fluorescent labeling techniques enable all four nucleotides to be analyzed together • Lasers are used to fluoresce the dye markers • Digital camera technology reads the dye markers • Computers are used to assemble the base sequence

3. 1. A 1 The causes of sickle cell anemia, including a base substitution mutation, a change to the base sequence of m. RNA transcribed from it and a change to the sequence of a polypeptide in hemoglobin. m. RNA Amino acids

3. 1. A 1 The causes of sickle cell anemia, including a base substitution mutation, a change to the base sequence of m. RNA transcribed from it and a change to the sequence of a polypeptide in hemoglobin.

3. 1. A 1 The causes of sickle cell anemia, including a base substitution mutation, a change to the base sequence of m. RNA transcribed from it and a change to the sequence of a polypeptide in hemoglobin.

3. 1. A 1 The causes of sickle cell anemia, including a base substitution mutation, a change to the base sequence of m. RNA transcribed from it and a change to the sequence of a polypeptide in hemoglobin.

3. 1. A 1 The causes of sickle cell anemia, including a base substitution mutation, a change to the base sequence of m. RNA transcribed from it and a change to the sequence of a polypeptide in hemoglobin.

3. 1. A 1 The causes of sickle cell anemia, including a base substitution mutation, a change to the base sequence of m. RNA transcribed from it and a change to the sequence of a polypeptide in hemoglobin.

3. 1. A 1 The causes of sickle cell anemia, including a base substitution mutation, a change to the base sequence of m. RNA transcribed from it and a change to the sequence of a polypeptide in hemoglobin.

3. 1. U 5 New alleles are formed by mutation. Learn. Genetics: What Is Mutation? http: //learn. genetics. utah. edu/content/vari ation/mutation/

3. 1. U 5 New alleles are formed by mutation.

3. 1. U 5 New alleles are formed by mutation.

3. 1. U 5 New alleles are formed by mutation.

3. 1. A 1 The causes of sickle cell anemia, including a base substitution mutation, a change to the base sequence of m. RNA transcribed from it and a change to the sequence of a polypeptide in hemoglobin. 6 th amino acid in the sequence

3. 1. A 1 The causes of sickle cell anemia, including a base substitution mutation, a change to the base sequence of m. RNA transcribed from it and a change to the sequence of a polypeptide in hemoglobin.

3. 1. A 1 The causes of sickle cell anemia, including a base substitution mutation, a change to the base sequence of m. RNA transcribed from it and a change to the sequence of a polypeptide in hemoglobin. https: //youtu. be/1 f. N 7 r. Ow. Dy. MQ