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CQA #4


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
Created by: rachel.patton
Popular Science sets




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