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Unformatted text preview: ”112 Unit Three: Grannies Morgan discovered a mutant white-eyed male fly How Linkage Afiects Inheritance.- Scierrtifie Inquiry thathematsdwithawild-typered—eyedfemale 'I'heF1 Morganperiormedatestcross ofF1 dihyhrid wild-type were all red-eyed. In the F}, hmrever, all female flies flies with flies that were homozygous recessive for werered~eyed.whereashalfofthema1eswere red- blackbodicsandyestigialwingsandfoundthatthe eyed and half were white—eyed. Morgan deduced that otfsprhtg were not in the predicted l:'.l:l:1 phenotypic thegenetoreyecolorwaslooatedonhronthexmno- classes. Rather,mcstoi'tl'e ofispfingwerethessme mesoote Males have only one X, so their phenotype is phenotypes as the P generation parents—either wild determined by the eye-color allele the},r inherit from type {grayl normal wings} or double mutant (black. their mother. This associationof a specific gene with a vestigial). Morgan deduced that these traits were in- chromosome pmyided evidence for the chromosome herited together because their genes were located on theory of inheritance. the same cluomosome. Genetic recombination results in offspring with combinations of traits that differ from those found in l IHTERACTWE QUESTION 15.1 eitherparent. Complete this summary of Morgan's crows with the mu- . . tent Mite-eyed fly by filling in the Punnett square and 6mm stmhinsficn “d mm In a cross be- . tween a dlhyhrid heterozygote and a recessive ho- showing the phenotype: and genotypes of the F2 genera mo to one-half of the ofis . will be oriental firm. (or stand: for the mutant recessive white allele; by” Efid’haue fihflgfl r the P of the for the wild-type red allele.) The r indicates that male Ermmmn PM??? mfim of “waging flies, wnh only one a: chromosome. carry only a single at- called IIi [m WEB [recomh' L will have 'E'E f” "hii We “’1‘" 99““ combinations of the two has that are unlike the pat- ents 'I'hisfil‘i’oh‘equencyofrecombinationisobserved Palm“ mm mm whentwogenesarelooatedondtfferentchromosomes Primates {mid-type} I--- -male ...__... -. ._.-_._im51 ii. {litmus $119111. HF @3149!“ ml Qiltflh'. .. W gouachromosomesatrnetaphaseiandtheresutflng Genotype w+ my independent assortment of alleles F1 mm“ mm WW I mresscrws duration 15.: W female I ““19 In ateetcrcss between a heterozygote tall, purple-flowered 6mm? N we pea plant and a dwarf. white-flowered plant, a. what are the phenotypes of offspring that are parental types? it“ b. what are the phenotypes of offspring that are recon-h binants't Phenotype Gmm’“ Linkedgenesdonotamort independentlyandone —— — — — would not expect to see recombination of parental traits in the offspring. Recombination of linked genie does occur, however, due to crossing over, the recipro- _ cal trade between mnsister {a maternal and apaternai] 15-2 Links“ Emu “-11" “be “merited chrometids of synapsed homologous chromosomes W' because they are located nest-each during prophase of meiosis I. The percentage of re— other-anthem ctuomosome combinent offspring is called the recombination fre- Genes that are located on the same chromosome and “with tendtoheinheritedtogefliersrecalledlinked genes. ...
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