Suppose meiotic drive affects the pollen only and that 80% of the pollen grains from a heterozygote carry the A allele. Ovules are normal, and 50% of them carry the A allele. What fraction of offspring from a selfing heterozygote will be heterozygous?
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Suppose meiotic drive affects the pollen only and that 80% of the pollen grains from a heterozygote carry the A allele. Ovules are normal, and 50% of them carry the A allele. What fraction of offspring from a selfing heterozygote will be heterozygous?
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- Suppose you have an AAaa tetraploid plant and it undergo self- fertilization. At least two copies of the dominant allele A are needed to obtain the dominant phenotype. At what frequency will progeny with the dominant phenotype appear?The probability that both alleles in the offspring are type A is the product of the probability that the allele from the pollen is A and the probability that the allele from the ovule is A (we will derive this in Section 6.5). What is the probability that the offspring of a homozygous parent is homozygous? What is the probability that the offspring of a homozygous parent is heterozygous?Suppose you have an AAaa tetraploid plant and it undergoes self-fertilization. At least two copies of thedominant allele A are needed to obtain the dominantphenotype. At what frequency will progeny with thedominant phenotype appear?
- A triploid plant has 18 chromosomes (i.e., 6 chromosomes perset). If we assume a gamete has an equal probability of receivingone or two copies of each of the six types of chromosome, whatare the odds of this plant producing a haploid or a diploid gamete?What are the odds of producing an aneuploid gamete? If theplant is allowed to self-fertilize, what are the odds of producing aeuploid offspring?Round seed is dominant over wrinkled. Yellow cotyledon is dominant overgreen. Full pod is dominant over constricted. The genes for these traits arefound on separate chromosomes. If a trihybrid plant is self-fertilized, whatproportion of the progeny will have round seeds in constricted pods?Express answer in fraction form.A male plant with genotype AaBBCcDdee was crossed with one heterozygous for all thegenes. (a) what is the probability of getting a pollen with ABcDe genes? (b) of producing anovum with three dominant and two recessive genes? (c) of getting a progeny with samephenotype as the female parent? (d) of progeny with exactly same genotype as the femaleparent? (e) If instead of the above male, the cross was with one heterozygous for all thegenes, what proportion of the offspring will have three dominant phenotypic traits. (f) willbe genotypically like the parents?
- In a cross between two varieties of corn, gl1gl1Ws3Ws3(eggparent) x Gl1Gl1ws3ws3 (pollen parent), a triploid offspringwas produced with the genetic constitution Gl1Gl1gl1Ws3ws3ws3.From which parent, egg or pollen, did the 2n gamete originate? Isanother explanation possible? Explain.what will be the offspring if the white grape fruit tree is homozygousa cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring with purple flowers.this demostrates.
- Suppose a plant is heterozygous with genotype Aa. What is the probability that the allele that came from the pollen is type A? What is the probability that the allele that came from the ovule is type A?. Seedless watermelons that you find in the supermarketare triploids, where x = 11. . What is the probability that a particular seed in atriploid watermelon will be viable? (Recall that aviable seed is a euploid zygote.)A pea plant has the genotype TtRr. The independent assortmentof these two genes occurs at ________ because chromosomescarrying the ________ alleles line up independently of the chromosomes carrying the ________ alleles.a. metaphase of meiosis I, T and t, R and rb. metaphase of meiosis I, T and R, t and rc. metaphase of meiosis II, T and t, R and rd. metaphase of meiosis II, T and R, t and r