Genetic+Inheritance+JO


 * Chapter 20 Patterns Of Genetic Inheritance**

Genotype: genes of an individual Alleles: alternative forms of genes having the same posistion on a chromosome and affecting the same trait Dominant: assigned the uppercase letter. if there is a dominant gene then the baby will get the dominant trait. Recessive: assigned the the losercase. you would need to only have recessive to have the recessive trait. any dominant and the trait is automatically dominant. homozygous dominant: two uppercase alleles or two dominant alleles. " recessive: two recessive alleles heterozygous: one dominant and one recessive allele Phenotype: physical appearance of someone
 * 1. Define genotype, alleles, dominant allele, recessive allele, homozgous dominant, homzygous recessive, heterozygous, phenotype**

genotypes are the actual genes, phenotype are the result of the genes.
 * 2. What is the difference between genotype and phenotype?**


 * 3. What are the three possible genotypes and the two possible phenoyptes for a characteristic that is controlled by two alleles, one being dominant and the other recessive?**

1. for each of the following genotypes, give all possible gametes: WW, WWss, Tt, Ttgg, AaBb a.WW: WW b. WWss: Ws Ws c.Tt: Tt d. Ttgg: Tg Tg tg tg e.AaBb: AB Ab aB ab 2.for each of the following, state whether a genotype or a gamete is represented a.D: gamete b.Ll: genotype c.Pw: genotype d.LlGg:gamete 3. what is the genotype of the individual from the following crosses a.EeSs b.SSee
 * 4. Write down the question and answer for questions 1,2,3 on page 423.**

Tay-sachs disease**: a well known autosomal recessive disorder that occurs usually among jewish people (in the US). it is the lack of the enzyme hexosaminidase A (Hex A). Lysosomes build up in many body cells, but he primary sites of storage of storage are the cells of the brain, which account for the onset of symptoms and the progressive deterioration of psychomotor functions.
 * 5. Define the following genetic disorders on pp. 431 to 432 Make sure you describe the function of the gene that is mutated and what happens with the mutated gene.

the baby is fine till four to eight months and then gradually becomes blind and helpless, develops uncontrollacle seizures and eventually becomes paralyzed.


 * cystic fibrosis**:also autosomal recessive, most common lethal genetic disorder among caucasians (in US). chloride ions fail to pass through a plasma membrane channel protein in the cells of the patients. (normally sodium and water follow) this would be the lack of water and which would cause abnormally thick mucus to build up in bronchial tubes and pancreatic ducts. this interferes with the function of the lungs and pancreas.


 * phenylketonuria**:


 * sickle-cell disease**:
 * marfan Syndrome**:
 * huntintongons's disease**: