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Cards In This Set
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When does DNA seperate into single chromosomes?
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Meiosis 1
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In what stage does chromosome cross over occur?
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Prophase 1
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What is the site of chromosome cross over called?
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Chiasma
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What allows some genes to sort independently from eachother
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Independent Assortment:
occurs due two pairs of homologous chromosomes can be arranged in two different
ways at metaphase I of meiosis
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Why do some gene pairs consengregate?
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Split cells from parent cells and produce gametes
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What is a single trait that more than 2 alleles?
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Monohybrid
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What is Epistasis?
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condition in which
certain alleles of one locus alter the expression of alleles of a different
locus
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What is Nondisjunction?
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Abnormal separation of sister chromatids or of homologous chromosomes caused by their failure to dijoin properly during mitosis or meiosis
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What is a Barr Body?
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a
condensed and inactivated X chromosome appearing as a distinctive dense spot in
the interphase nucleus of certain cells of female mammals
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What is Codominance?
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condition in
which two alleles of a locus are expressed in a heterozygote (A, B, AB blood type)
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What genetic difference causes Sickel cell amnemia
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Have amino acid valine instead of glutamic acid
at position
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Beadle and Tatum
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one gene, one-enzyme hypothesis, each mutant strain had a mutation in only one
gene and that each gene affected only one enzyme. Conclusion: genes
regulate specific chemical events
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Who proposed the double helix model of DNA
structure? What experimental data was their model based on?
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Rosalind Franklin and Maurice WilkinsX-ray crystallographic films of DNA patterns
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What was the work and conclusion of Briggs and
King regarding the intracellular location of genetic material?
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Transplanted nuclei from frog
cells at different stages of development into egg cells whose nuclei had been
removed. A transplanted nucleus cannot control normal behavior.
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What is the shared term for the monomers that
make up DNA and RNA?
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Amino acids
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