In the garden pea, yellow cotyledon color is dominant to green, and inflated pod shape is dominant to the constricted form. When both of these traits were considered jointly in self fertilized dihybrids, the offspring appeared in the following numbers:
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- The dominant C allele of a gene that controls color in corn produces kernels with color; plants homozygous for a recessive c allele of this gene have colorless or white kernels. What kinds of gametes, and in what proportions, would be produced by the plants in the following crosses? What seed color, and in what proportions, would be expected in the offspring of the crosses? a. CCCc b. Cccc c. CcCc15. Albinism in corn plants is caused by a recessive lethal gene that results in death before maturity. What will the adult phenotypic ratio be for the F1 generation of heterozygous parents? 16. Huntington's chorea is a dominant lethal in humans. The disease does not appear until later in life, so that afflicted individuals may already have produced children. What are the F1 genotypic and phenotypic ratios of parents who are homozygous dominant and heterozygous?Which of the following statements is true regarding the phenotypic effects of inversions? Select ALL that apply. Heterozygotes are often healthy individuals because these mutations do not impact the dosages of any genes Heterozygotes often exhibit reduced fertility, because translocated and wild-type chromosomes do not separate correctly during meiosis II Homozygotes are often healthy individuals because these mutations do not impact the dosages of any genes Heterozygotes often exhibit reduced fertility, because crossing over between inverted and wild-type chromosomes in Meiosis I results in inviable gametes Heterozygotes often exhibit reduced fertility, because crossing over between inverted and wild-type chromosomes in Meiosis Il results in inviable gametes
- Rev. 67 6. What do the letters on the axes of the Punnett square represent? 7. Using the Punnett square below, what would be the resulting genotypes of offspring from an FF x ff monohybrid cross? 8. What is the difference between a monohybrid cross and a dihybrid cross? 9. If two heterozygous plants are crossed, what is the chance that the offspring will be FF? Use a Punnett square to support your answer.. In nature, the plant Plectritis congesta is dimorphic forfruit shape; that is, individual plants bear either winglessor winged fruits, as shown in the illustration.Wingless fruit Winged fruitPlants were collected from nature before floweringand were crossed or selfed with the following results:Number of progenyPollination Winged WinglessWinged (selfed) 91 1*Winged (selfed) 90 30Wingless (selfed) 4* 80Winged × wingless 161 0Winged × wingless 29 31Winged × wingless 46 0Winged × winged 44 0*Phenotype probably has a nongenetic explanation.Interpret these results, and derive the mode ofinheritance of these fruit-shaped phenotypes. Usesymbols. What do you think is the nongeneticexplanation for the phenotypes marked by asterisks inthe table?9. In the F2 Generation, both the male and female pea plants are heterozygous for round/wrinkles seeds. 1)Draw a Punnett square that shows this cross. 2)What are the possible genotypes? 3)What are the possible phenotypes? 10. In pea plants, the allele for smooth pods (P) is dominant over the allele for pinched pods (p). Construct a Punnett Square that shows a cross between an PP plant and an Pp plant. Predict what percent of the offspring are likely to have smooth pods. Essay: Is it possible for a son to inherit an allele on an X chromosome from his father? Explain why or why not.
- 4. In Drosophila melanogaster, a yellow-bodied (dark coloured) male with vestigial (underformed) wings is crossed to a wildtype female (brown body, red eyes). The F1 generation are all wildtypes. An F1 male and female are crossed and the F2 progeny consists of 16 vestigial-winged males with yellow bodies, 48 yellow males with normal wings, 15 males with vestigial wings and yellow bodies, 49 wildtype males, 31 vestigial winged females with brown bodies and 97 wildtype females. Explain the inheritance pattern of the 2 genes.1. Let's take the example of the gray kangaroo (Macropus fuliginosus) whose ploidy is 8 and the sexual determinism of this species is carried out according to the XY mode. From a male kangaroo: a) Draw the karyotype of this individual, obtained by stopping division at metaphase. Your drawing should include: a. All maternal and paternal chromosomes involved (different colors) b. An example of autosome and heterochromosome c. An example of homologous chromosome, sister chromatid and centromere. d. The total number of chromosomes in a metaphase kangaroo cell. e. A sentence to explain the difference between the terms gene and allele that might apply to this species.Asap
- 11. In Drosophila, three autosomal genes have the following map 5 m.u. 10 m.u. b + When a+ b+ c+ abc females are crossed to a bclabc males, how many flies of the phenotype a+ b c+ is expected among 1000 progeny assuming interference of 60%? A) 1 B) 2 C) 5 D) 3 E) 101. If you allow the original unknown plant to self-fertilize, what is the probability of recovering offspring with wrinkled, green OR round, yellow peas? Complete the following steps to answer the question: a. What is the cross? (Write out the genotypes being crossed, based on your answer to 3c.) b. What are the target genotypes? (Use the Y_ and R_ notation). c. Break it down into single gene crosses: i. At the R locus only, what ratio of round:wrinkled do you expect from the cross? ii. At the Y locus only, what ratio of yellow:green do you expect from the cross? d. What is the total probability of getting offspring with wrinkled, green OR round, yellow peas? Use the multiplication and addition rules and show your work!2) Discuss the genetic variability introduced by crossing-over and independent assortment. How is this important in sexually reproducing populations? Would these be important in a single-celled organism that reproduces asexually by mitosis?