DR+ch+20+hw

Chapter 20 Patterns Of Genetic Inheritance 1. Define genotype-Genes of the individual , alleles-having the same position on a pair of chromosomes and affecting the same trait , dominant allele-allele that is assigned to an uppercase letter , recessive allele-same as dominant allele but given a lower case , homozgous dominant-an EE genotype , homzygous recessive-ee genotype , heterozygous-Ee , phenotype-a trait 2. What is the difference between genotype and phenotype? A phenotype is any characteristic of an individual and a genotype is not

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?

4. Write down the question and answer for questions 1,2,3 on page 423. a. WW WW b. WWss Ws Ws c. Tt Tt d. Ttgg Tg Tg tg tg e. AaBb AB Ab aB ab 2. a D gamete b. Ll genotype c. Pw gamete d. LlGg genotype

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. Tay-sachs disease-lack of enzymes cystic fibrosis-Chloride ions do not pass through the plasma membrane and it infects the lungs and pancreas phenylketonuria-lack of metabolism enzyme sickle-cell disease-red blood cells are not normal marfan Syndrome-defect in connective tissue that affects the limbs and chest huntintongons's disease-mutated gene for the huntungongons gene and it affects the brain.