Match the exception to Mendel's rules to Its exanmple. if there are three genes that determine freckledness v and the more dominant alleles a person has the more freckles they exhibit
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Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
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- More Crosses with Pea Plants: The Principle of Independent Assortment Determine the possible genotypes of the following parents by analyzing the phenotypes of their children. In this case, we will assume that brown eyes (B) is dominant to blue (b) and that right-handedness (R) is dominant to left-handedness (r). a. Parents: brown eyes, right-handed brown eyes, right-handed Offspring: 3/4 brown eyes, right-handed 1/4 blue eyes, right-handed b. Parents: brown eyes, right-handed blue eyes, right-handed Offspring: 6/16 blue eyes, right-handed 2/16 blue eyes, left-handed 6/16 brown eyes, right-handed 2/16 brown eyes, left-handed c. Parents: brown eyes, right-handed blue eyes, left-handed Offspring: 1/4 brown eyes, right-handed 1/4 brown eyes, left-handed 1/4 blue eyes, right-handed 1/4 blue eyes, left-handedIn Figure 2-11, assume (as in corn plants) that allele Aencodes an allele that produces starch in pollen and allele a does not. Iodine solution stains starch black. Howwould you demonstrate Mendel’s first law directly withsuch a system?In Figure 1-6, the students have 1 of 15 different heights,plus there are two height classes (4′11″ and 5′ 0″) forwhich there are no observed students. That is a total of17 height classes. If a single Mendelian gene can account for only two classes of a trait (such as purple orwhite flowers), how many Mendelian genes would beminimally required to explain the observation of 17height classes?
- For all seven characters described in the data of Mendel allowed the F2 plants to self-fertilize. He found that whenF2 plants with recessive traits were crossed to each other, theyalways bred true. However, when F2 plants with dominant traitswere crossed, some bred true but others did not. A summary ofMendel’s results is shown to the right When considering the data in this table, keep in mind that theydescribe the characteristics of the F2 generation parents that haddisplayed a dominant phenotype. These data were deduced byanalyzing the outcome of the F3 generation. Based on Mendel’slaws, explain why the ratios were approximately 1:2Pea plants have pods that are smooth (inflated) or constricted in shape and green or yellow incolor. These two autosomal traits observe the laws of Mendelian inheritance and assortindependently of one another. One gene affects pod shape and one gene affects pod color. Theallele for the smooth shape of pods (I) is dominant over the allele for the constricted shape ofpods (i) and the allele for the green color of pods (G) is dominant over the allele for the yellowcolor of pods (g).A pure breeding female parental pea plant with smooth green pods is cross-fertilized with a purebreeding parental male pea plant with constricted yellow pods. The resulting F1 generationplants are then self-fertilized and F2 generation progeny are obtained.The distribution of the appearance or phenotypes of the pods of the F2 generation plants are______.a- 100% smooth green podsb- 100% constricted yellow podsc- 50% smooth green pods, 50% constricted yellow pods, 0% smooth yellow pods, 0%constricted green podsd-…A woman who is heterozygous, Bb, has brown eyes; B (brown) isthe dominant allele, and b (blue) is recessive. One of her eyes,however, has a patch of blue color. Give three different explanationsfor how this might have occurred?
- In a typical one trait experiment of Mendel's, yellow pureline peas (YY) are crossed with green pureline peas (yy). The offspring are yellow. Then, those offspring are selfed. Which statements are / would be true about this experiment?In cats, a temperature-sensitive allele produces the Siamese phenotype, in which the cooler extremities are dark and the warmertrunk area is lighter. A Siamese cat that spends most of its timeoutside was accidentally injured in a trap and required severalstitches in its right front paw. The veterinarian had to shave the furfrom the paw and leg, which originally had rather dark fur. Later,when the fur grew back, it was much lighter than the fur on theother three legs. Do you think this injury occurred in the hot summer or cold winter? Explain your answerAlleles that show incomplete dominance will represent: Choose oneAnswer: A . heterozygotes that have a phenotype intermediate between the dominant and recessive alleles. B. homozygotes that have a genotype like the recessive allele C. homozygotes that have a phenotype intermediate between the dominant and recessive alleles. D. heterozygotes that have a genotype like the dominant allele
- n each case where Mendel crossed (i.e., mated) two different true-breeding plants as parents, the offspring displayed only one of the two traits seen in the parents. For instance, a cross between a true-breeding “tall” plant and a true-breeding “short” plant produced offspring that were all “tall.” This observation supports which principle of genetics? a. The law of segregation b. The law of independent assortment c. Dominance and recessiveness d. Allele anomaly e. Gene linkageMendel discovered that pea traits were inherited as unit factors occurring in pairs, these distributing to subsequent generations randomly through the gametes. The unit factors would not have been paired ifA) the temperature had been differentB) pea plants had not been diploidC) peas had been self-fertileD) The statement is false: unit factors occur singly in Mendel’s sweet peasE) The statement is false: unit factors occur in sets of three in Mendel’s sweet peas Which of the following statements about the theory of epigenesis is incorrect? A) William Harvey was its main proponent back in the 1500s and 1600s.B) It recast the focus of life to the egg, away from male contributions which had dominated theory for centuriesC) It was incompatible with the notion of preformationism, which had been popular for some timeD) It suffered from teleological notions in that it argued that the organism developed with a certain drive in a certain direction as if it knew where it was going or had a…When Gregor Mendel performed his breeding experiments on pea plants, he discovered that tallness in the plants is inherited through a simple dominant trait (coded "T") with shortness as the recessive trait (coded "t"). Imagine that Mendel bred a homozygous dominant pea plant with a pea plant heterozygous for tallness. Draw a Punnett Square to help you answer this question and the next one: In the 1st generation of offspring, we expect the genotypes (for tallness) to include… a) 50% homozygous dominant, 50% heterozygous b) 100% heterozygous c) 50% tall, 50% short d) 100% tall e) None of the above