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State Objectives
Semester Exam Review pg 2
Term | Definition |
---|---|
fungi | destroy tissue and blood cells. Examples: athlete's foot, wounds will not heal, and ring worms |
traits | all the features that an organism inherits |
gene | part of DNA code on a chromosome |
chromosome | carries genes that determine heredity. (found in the nucleus) |
genotype | genetic makeup |
phenotype | traits you see when you look at an organism |
allele | different form of genes |
homozygous | alleles that are the same for a trait |
heterozygous | alleles that are different for a trait |
Dominant Alleles | trait that will always show up when in the genotype. (Capital letters are used to show dominant traits) |
Recessive traits | will only show up in the genotype when 2 are present. One recessive trait from each parent. (Lower case letters are used to show recessive traits |
Punnett square | a model used to predict the possible offspring of crosses between different organisms of known genotypes |
Selective breeding | the process by which desired traits of certain plants and animals are selected and passed on to future generations. |
Selective breeding | The male and female are selected to be bred or mate for offspring. It could take several generations before traits show up. Examples: dairy cows, cotton seeds, vegetables, horses, dogs, etc... |
Genetic engineering | biological and chemical methods to change the arrangement of DNA that make up genes or plants and animals |
Reasons AGAINST selective breeding and genetic engineering... | 1. Changing one gene may negatively affect other genes. 2. Long term health effects are not known. 3. May harm natural world. 4. New kinds of crops may create new kinds of poisons and allergies. |
Mississippi State University | is conducting research to improve food production using genetic engineering |