In monohybrid cross of red and white flower, Mendel got only red flower. On setting the F1 plants having red flower he got both plants with red and white flower. Explain the basis of using RR and rr symbols to represent the genotype of plants of parental generation.
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- More Crosses with Pea Plants: The Principle of Independent Assortment Consider the following cross: P1: AABBCCDDEE aabbccddee F1: AaBbCcDdEe (self-cross to get F2) What is the chance of getting an AaBBccDdee individual in the F2 generation?Figure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are dominant to green (y). What are the possible genotypes and phenotypes for a cross between PpYY and ppYy pea plants? How many squares would you need to complete a Punnett square analysis of this cross?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-handed
- Imagine that you are performing a cross involving seed texture in garden pea plants. You cross true-breeding round and wrinkled parents to obtain F1 offspring. Which of the following experimental results in terms of numbers of plants are closest to what you expect in the F2 progeny? a. 8lOroundseeds b. 8lOwrinkledseeds c. 405:395 round seeds:wrinkled seeds d. 610:190 round seeds:wrinkled seedsA trait in garden peas involves the curling of leaves. A two-factorcross was made by crossing a plant with yellow pods and curlingleaves to a wild-type plant with green pods and normal leaves. AllF1 offspring had green pods and normal leaves. The F1 plants werethen crossed to plants with yellow pods and curling leaves. Thefollowing results were obtained: 117 green pods, normal leaves115 yellow pods, curling leaves78 green pods, curling leaves80 yellow pods, normal leavesA. Conduct a chi square analysis to determine if these two genesare linked.B. If they are linked, calculate the map distance between the twogenes. How accurate do you think this calculated distance is?Mendelian Genetics F1 Cross: Tall, White, Axial x Dwarf, Violet, Terminal DdwwAA X ddWWaa Character: Stem height, Flower color & position Use fork-line method to check the F2. Show and interpret all the possible genotypes and phenotypes of the offsprings.
- Gregor Mendel's first step was to isolate True breeding Parents. What were the Genotypes of the True Breeding Parents? O All Homozygous Dominant O All Homozygous Recessive All Heterozygous O All Homozygous MA strain of plants has a mean height of 24 cm. A second strain ofthe same species from a different geographical region also has a mean height of 24 cm. When plants from the two strains arecrossed together, the F1 plants are the same height as the parentplants. However, the F2 generation shows a wide range ofheights; the majority are like the P1 and F1 plants, but approximately4 of 1000 are only 12 cm high, and about 4 of 1000 are36 cm high. Question: What mode of inheritance is occurring here?. A geneticist mapping the genes A, B, C, D, and E makestwo 3-point testcrosses. The first cross of pure lines isA/A ⋅ B/B ⋅ C/C ⋅ D/D ⋅ E/E × a/a ⋅ b/b ⋅ C/C ⋅ d/d ⋅ E/EThe geneticist crosses the F1 with a recessive tester andclassifies the progeny by the gametic contribution ofthe F1:A ⋅ B ⋅ C ⋅ D ⋅ E 316a ⋅ b ⋅ C ⋅ d ⋅ E 314A ⋅ B ⋅ C ⋅ d ⋅ E 31a ⋅ b ⋅ C ⋅ D ⋅ E 39A ⋅ b ⋅ C ⋅ d ⋅ E 130a ⋅ B ⋅ C ⋅ D ⋅ E 140A ⋅ b ⋅ C ⋅ D ⋅ E 17a ⋅ B ⋅ C ⋅ d ⋅ E 131000The second cross of pure lines is A/A • B/B • C/C • D/D •E/E × a/a • B/B • c/c • D/D • e/e.The geneticist crosses the F1 from this cross with arecessive tester and obtainsA ⋅ B ⋅ C ⋅ D ⋅ E 243a ⋅ B ⋅ c ⋅ D ⋅ e 237A ⋅ B ⋅ c ⋅ D ⋅ e 62a ⋅ B ⋅ C ⋅ D ⋅ E 58A ⋅ B ⋅ C ⋅ D ⋅ e 155a ⋅ B ⋅ c ⋅ D ⋅ E 165a ⋅ B ⋅ C ⋅ D ⋅ e 46A ⋅ B ⋅ c ⋅ D ⋅ E 341000The geneticist also knows that genes D and E assortindependently.a. Draw a map of these genes, showing distances inmap units wherever possible.b. Is there any evidence of interference?
- . In common wheat, Triticum aestivum, kernel color is determined by multiply duplicated genes, each with an Rand an r allele. Any number of R alleles will give red, anda complete lack of R alleles will give the white phenotype.In one cross between a red pure line and a white pureline, the F2 was 6463 red and 641 white.a. How many R genes are segregating in this system?b. Show the genotypes of the parents, the F1, and the F2.c. Different F2 plants are backcrossed with the whiteparent. Give examples of genotypes that would give thefollowing progeny ratios in such backcrosses: (1) 1 red :1 white, (2) 3 red :1 white, (3) 7 red :1 white.d. What is the formula that generally relates thenumber of segregating genes to the proportion of redindividuals in the F2 in such systems?What is Mendel's Cross? Can you shre practical life aplications related to this?4. Albinism is lethal in plants, but many plants produce albino offspring. If albino plants C always die before reproducing, how does albinism persist? Migh ne 5. Mendel crossed pea plants producing round seeds with those producing wrinkled seeds. Of 7,324 F2 seeds, 5,464 were round, and 1,860 were wrinkled. Using the symbols W and w for the alleles, (a) symbolize the original P₁ cross; Slover don pet (b) determine the parental gametes; 69 (c) show the F₁ offspring; (d) show a cross between two F₁ plants; dong berbella" 10. Jogolų ar preu 39 woy Your Mirb & ever ascohes berloste di ritod 8 201 artW.20 meylo evit bins tight pdchse sent sitt 10 euogysomod Ceadolise borbeis blirib o svad Jism adoles Parl (e) symbolize the F₁ gametes; and, odb seit (f) summarize the expected F2 results for phenotypes, genotypes and phenotype ratios. mun 100 3161 16 gr nation ritiw nam A (6) His neblinks Sylimstedt phow yd showenis uby sloy 6 or be 160 (0) endonce 100 to eno elouosis na (b) wari hot…
