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Genetics
Dec 12 2018 test
Term | Definition |
---|---|
Heredity | The passing of traits from parents to offspring |
Genetics | branch of biology concerned with the study of genes, genetic variation, and heredity in living organisms. |
Genes | Instructions for an inherited trait |
Chromosomes | Where genes are located |
DNA | Is the actual molecule that carries the instructions for inherited traits. Found in chromosomes. |
Phenotype | What you physically look like. Your outside appearance. ie brown vs red hair |
Genotype | combination of alleles that an organism gets from its parents |
Dominant allele | Capital Letters. If even one dominant allele is present it will show and hide the recessive allele |
recessive allele | Lowercase letters. You can show a recessive trait only f you get one from each parent |
trait | Different forms of characteristics that we have. Height, tallness, eye color, hair colors |
monohybrid Punnett Square | square used to predict the probability of an offspring's genotype and phenotype |
homozygous | Having two of the same allele. Either all dominant or all recessive. rr or RR Also called purebred. |
heterozygous | Having two different alleles. One dominant and one recessive. Rr Also called hybrid |
alleles | The letters that represent the traits that offspring get from their parents. |
probibility | The mathematical chance that something can happen |
Selective Breeding/Artificial Selection | When humans select for the traits that they desire in animals and plants. ie breeding small chihauhuas together to continue to get smaller chihuahuas. |
natural Selection | the process whereby organisms better adapted to their environment tend to survive and produce more offspring. ie they have more useful phenotypes. THIS HAPPENS SPONTAEOUSLY. |
sexual reproduction | Where offspring are formed from the union of parents. Share genetic material with both parents. Look similar to parents, but not identical |
Assexual reproduction | Split off from only one parent. Will be identical to that parent. |
Genetic variation | The differences in genes and traits among individual organism in a population. |