Q9: For Punnet’s experiment (Fig. 5.2 on p117), if we want to measure the RF bet
ID: 194587 • Letter: Q
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Q9: For Punnet’s experiment (Fig. 5.2 on p117), if we want to measure the RF between the gene that determines the color of the flower and the gene that determines the shape of the pollen, what mating should we set up? (Please write down the genotypes of the two strains you are going to use).Linkage, Recombination, and Eukaryotic Gene Mapping 117 rogeny reproduces, the com- may differ from the combi parents. In other words, the allele combinations A b or Experiment Question: Do the genes for flower color and pollen shape in sweet peas assort independently? es A Bor a b Methods Cross two strains homozygous for two different traits s of segregation and inde- g the progeny of genetic t biological processes pro- Walter Sutton proposed a ciples, called the chromo- olds that genes are found Let's restate Mendel's two mosome theory of hered tates that a diploid organ- racteristic, each of which locus, on each of the two P generation Homozygous strains Purple flowers, long pollen Red flowers, round pollen O Pollen Fertilization chromosomes segregate s one homolog. The prin- ates that, in meiosis, each assorts independently of new perspective, it is easy omes in most organisms n to be more genes than be present on the same rt independently. Genes chromosome are called linkage group. Linked entually arriving at the and are not expected to Fi generation Purple flowers long pollen Self-fertilization Results F2 generation d by Mendel in peas did the first genetic char- s also seemed to assort e carried on a limited rt independently? ween the principle of hromosome theory of 21 Red 284 21 Red PurplePurple flowers, flowers, flowers, flowers, pollen pollen round pollen long pollen logists began finding assort independently sweet peas by william Conclusion: F2 progeny do not appear in the 9 3 3 . 5.2 Nonindependent assortment of flower color and pollen shape in sweet peas. 5.2 Linked Genes Segregate Together, While Crossing Over d Reginald C. Punnett ratio expected with independent assortment. strain of peas that had s with a homozygous pollen grains. All the en grains, indicating d long was dominant the Fi, the resulting : 3: I ratio expected 5.2). An excess of F Produces Recombination len or red flowers and Between Thenm ). Although Bateson, lose together on the same chromosome usually
Explanation / Answer
In this parent 1 is PPAA
parent second ppaa
P = purple flower
p= red flower
A = long pollen
a= round pollen
these results gives the idea that genes for Pollen shape and flower colour are linked genes.
linked genes means both jeans are present on the same chromosome that is why they cannot assort independently.
the transfers and to offsprings in the link form.
the Recombinant offsprings are produced due to the recombination process that occurred in the meiosis first step of cell division.
Here the ratio deviates from mendel's dihybrid cross ratio because genes are linked that is why they didn't shown independent assortment phenomenon.
Linkage can be calculated by putting values and the formula of linkage.
Linkage = recombinant/ total offsprings
linkage is inversly proportional to the recombination.
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