click below
click below
Normal Size Small Size show me how
CQA #4
vocab
Term | Definition |
---|---|
evolution | change over time |
natural selection | organisms that are better suited for the environment will survive and reproduce |
artificial selection | manmade breeding for certain traits (ie, dog breeds) |
homologous structures | structures that are used for different functions but have the same structures on the inside (bones of a whale, cat, human) |
analogous structures | structures that look similar (ie, wings) but have different internal structures (ie, wings on a bird and butterfly) |
vestigial structures | structures that have no use for present-day organism, leftover from evolution (ie, hip bones in whales) |
DNA | deoxyribonucleic acid, blueprint for living things |
genes | section of DNA or section of chromosome |
chromosome | coiled-up DNA in a package for cell division |
mitosis | cell division of body cells for growth and repair, one cell divides into two cells |
meiosis | cell division of sex cells, form gametes, one cell divides into four cells |
sexual reproduction | strategy that requires two parents, forms unique offspring |
asexual reproduction | strategy that requires one parent, offpsring is exact copy of parent |
allele | different version of same gene (brown, green, blue eyes) |
dominant | stronger version of allele, will present the phenotype even if only one allele is present |
recessive | weaker version of allele, will only present itself in phenotype if no dominant alleles are in genotype |
homozygous | two copies of the same allele (TT or tt) |
heterozygous | different copies of allele (Tt) |
genotype | letter combination of alleles for a trait (TT, Tt, tt) |
phenotype | physical expression of trait (green eyes) |
Punnett square | a tool used to predict the probability of inheriting a particular trait |