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explain the history of darwins finchesthe most well known evidence upon which darwin based his theory was the distribution pattern of the galapagos
describe the theory of darwinsmost scientists today accept the theory that living organisms have evolved according to the concept that was first
explain the lamarcks theory in evolutionprior to darwin most people believed in and held to the creationist viewpoint that species were created in
history of evolutionevolution is usually defined as change over time in spite of the incredible diversity of life found on earth many fundamental
what is polymerase chain reactionin geneticsa great advance in sequencing and cloning dna is the polymerase chain reaction devised by the american
explain the recombinantion of dna recombinant dna is made by combining dna from more than one source - often from very different species the
explain brifly what is genetic engineering genetic engineering engineering techniques have been used in agriculture and horticulture for centuries
explain the eukaryotic gene expression eukaryotic cells regulate the transcription of individual genes large parts of chromosomes or even entire
what is gene expression gene expression is the process by which a gene is activated to produce a certain protein cells are able to respond to changes
what is translocationsometimes pieces of two chromosomes that are not homologous break off at the same time if the broken pieces are re-attached to
explain what is inversion inversion is another way in which genetic recombination can occur as seen below in this case the change occurs within a
explain crossing over in geneticscrossing over is when the arms of homologous chromosomes exchange segments and therefore genes with each other
what is genes duplication duplication of genes can happen when a portion of a chromosome breaks off and attaches itself to the end of its homologous
what is deletion of cella deletion is simply when a tip or fragment of a chromosome breaks off and fails to reattach itself to the chromosome from
describe genetic recombination genetic recombination which provides the variation necessary for evolution can occur through a variety of processes
point mutations are often caused by substances called mutagens explainpoint mutations are often caused by substances called mutagens base analogs
explain point mutations gene mutations involving single genes occur by addition substitution or deletion of a single base in dna such mutations
explain the term mutationsmutations are changes in the genetic structure of an organism that occur at random or are the results of environmental
what is multiple alleles obviously diploid organisms such as humans can have only two different alleles for a certain gene locus however new alleles
explain the pair of chromosomes and sex chromosomesmorgan also noticed that one pair of chromosomes is different in male and female flies one of the
what is chromosome mapping in phenotypic traitchromosome mapping by noting how often a gene segment associated with a specific phenotypic trait
what is the role of linked traits in geneticsin his study of inheritance in the fruit fly morgan observed that certain genes are distributed together
what is cytogeneticsbefore the advent of modern technology the american biologists thomas hunt morgan gw beadle h sturtevant barbara mcclintock and
explain the factor chromosomal inheritancea huge step forward in our understanding of heredity came in 1902 when a biologist named walter s sutton
what is mendels crosses in genetics explain breiflymendel found that if he transferred pollen from a green-seed strain to a yellow-seed strain and