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AP Biology Chapter 15 Flashcards

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113092254Genes are located onChromosomes
113092255Diploid CellsChromosomes and genes are both present in pairs in diploid cells. Homologoud chromosomes separate and alleles segregate during the process of meiosis.
113092256Chromosomal Theory of inheritanceMendelian genes have specific positions on chromosomes, and it is the chromosomes that undergo segregation and independent assortment.
113095398Wild typethe most common phenotype for a character.
113095399Thomas Hunt Morganexperiment with the flies, had a white one which he initialized as w. + = allele for wild type
113102264flys chromosomesfemale XX male XY
113102265Morgan's breading resutlsAll f1 was red eye, f2 had 3:1 ratio. White eye showed up only in males.Eye color was linked to sex
113102266Fly chromosomes and his experimentwhite eye exclusively on x chromosomes. Male has only one x chromosome so there is no dominant to offset it. Female could only have white eye if both x's were it. This was impossible since the male had it.
113108627Chromosome gene ratio:Way more genes then chromosomes, each chromosome has hundreds to thousands of genes.
113108628Linked GenesGenes located on the same chromosome that tend to e inherited together in genetic crosses.
113128025Morgan's second experimentcolor and wing size are partially linked to genetics.
113128026Genetic Recombinationthe production of offspring with combination of traits differing from those fond in either parents.
113128027meiosis and fertilizationgenerate genetic variation among offspring of sexually reproducing organisms.
113147826Parental Typesmatch one of the parents phenotypes.
113147827Recombinant Typesdifferent combination of phenotype then parent
11314782850% of offspring are recombinant50% frequency of recombination
113147829genes that are located on two different chromosomes50% frequency of recombination
113147830Linked genesless then 50% frequency of recombination
113175602Crossing overoccurs doing prophase of meiosis 1
113199762Genetic Mapan ordered list of the genetic loci along a particular chromosomes.
113199763Range and crossing overfarther apart two genes are higher likelihood of crossing over.therefore, higher recombinant frequency.
113199764Linkage Mapgenetic map based on recombination frequencies.
113199765Map Unitsone map unit = 1% recobination frequency.
113199766Some genes are so far apartcrossover between them is certain.
113199767Cytogenetic mapslocate genes with respect to the chromosomal features.
113346560X OR Y BIGGER?X
113346561MALES SPERM1/2 X 1/2 Y
113375256SEX CHROMOSOMESHAVE MANY GENES UNRELATED TO SEX (ESPECIALLY X)
113375257SEX LINKED GENEGENE LOCATED ON SEX CHROMOSOME
113424599BARR BODYinactive x female condenses into it. inside the nuclear enveope.
113424600Females consist of a mosiac of two types of cellsthose with active x derived from the father and those with active X derived from the mother.
113484069NondisjuctionMitotic spindle distributes chromosomes, error occurs.
113484070Nondisjuction in meiosis 1members of a pair of homologous chromosomes do not move apart properly during meosis 1
113484071Nondisjuction in meiosis 2sister chromatids fail to seperate
113484072if nondisjunction occurs in mitosiscondition is passed to a large number of cells. very bad
113542938Aneupolid Gametescaused by nondisjection in meiosis.
113542939Anuepolid ZygoteAneupolid gamete combinds with a normal haploid gamete during fertilization. Very bad.
113647202Nondisjunction of sex chromosomesnot as bad.
113647203XXY in male..bad
113647204Worst type of chromosome changesDeletion and translocation.
113653002Genomic Imprintingvariation in phenotype depending on whetheran allele is inherited from male or female parent.
113653003Genomic imprinting occursduring the formation of gametes. e
113653004Two exceptions to mendelgenes located in nucleor or near nucleus

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