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Transcript
Genetics WEBQUEST: Turn sound off. Turn subtitles on Link 1: http://www.bbc.co.uk/schools/gcsebitesize/science/21c/genetics/inheritanceact.shtml INHERITANCE Inherited characteristics are controlled by __________. Genes may have different forms called ________________ . Eye color has two alleles. ____________ and __________________ What color will your eyes be if you have a brown and and blue allele? ___________ Using Genetic diagrams: Capital letters mean the allele is _____________ & lower case letters mean the allele is _________________ Which combination from the genetic diagram gives blue eyes? _________ This is how _______________________________ can be expressed in the children. HUNTINGTON’S DISEASE affects the nervous system. Huntington’s disease is caused by a ________________ allele. This means you only need________ allele to get the disease. Fill in the diagram below. What percentage of the offspring will have Huntington’s disease? ___________ Parent 1 Parent 2 Link 2: From the sidebar list, click genes come in pairs http://www.dnaftb.org/2/concept/index.html Mendel focused on 7 individual traits in pea plants. 1. Pure bred plant strains contained only ________form of the gene. Click animation now. 2. What are some phenotypes of Mendel’s peas? Give 3 examples: a. __________________________________________________ b. __________________________________________________ c. __________________________________________________ 3. Give the genotype of the green seed and yellow seed. Green: ___________ Yellow: _____________ 4. A pure-bred pea always has ______ copies of the same allele. Link 3: Punnett Squares and the probability of Inheritance. http://anthro.palomar.edu/mendel/quizzes/mendqui2.htm CYSTIC FIBROSIS affects cell membranes causing certain cells to produce too much mucus. This affects ______________ and ___________________. Cystic Fibrosis is a recessive disease. You need to have ____ alleles to get the disease. Two small “f’s” means you (have/do not have) the disease. T or F Carriers do not show the trait for cystic fibrosis. There is a ______% chance that children will inherit both dominant alleles and not be a sufferer or be a carrier. T or F Embryos can be screened for Genetic diseases. Sex chromosomes: Differences in men and women Humans have ______ pairs of chromosomes. Sex chromosomes determine whether you are X or Y. Women have ___ ___. Men have ___ ___ Sperm and egg cells are _____________. All eggs have ___ chromosomes Sperm can have ____ or _____ chromosomes. When egg and sperm pair up, which combination produces a male child? __ A female child? _____ Answer the 6 problems given and check to see if you are correct. Use the Vocabulary Reminders below to help you solve the problems. Homozygous dominant: TT Homozygous recessive: tt Heterozygous (hybrid): Tt Carriers: A hybrid person with a recessive trait for a disease but they do not show the disease themselves. 1. ________ 2. ________ 3. – 6. Use the Punnett squares below to answer these questions. 3. 4. 5. 6.