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A plant species X with n=5 chromosomes was crossed with a related species Y with n = 7 chromosomes. The F1 hybrids produced only a few pollen grains, which were used to fertilize the ovules of related species Z with n=7 chromosomes. A few plants were produced from this cross, and all had 19 chromosomes. The F1 hybrids (with 19 chromosomes) were mated with related species W with n=11 chromosomes. A few plants were produced from the cross and all had 30 chromosomes. Following self-fertilization of the F1 hybrids a few F2 plants were produced, each with 60 chromosomes. These plants were phenotypically different from either of the original species and were highly fertile.
a. Explain by diagram and description the events that produced these fertile F2 hybrids. You must be specific and very clear about what is happeningb. Give the karyotype of the gametes produced by the highly fertile F2 plants.c. Using appropriate genetic terminology, tell what type of plant ultimately arises as a result of the above crosses.
What is the difference between orthologs and paralogs and why are only orthologous comparisons useful for determining evolutionary relationships?
Glucose oxidase is an enzyme that can be used for measurements of glucose levels by combining this reaction with an oxygen probe.
If the steric demands of the leaving group in the 2-methyl-s-butyl system were greater than those of a methyl group, why would 2-methyl-1-butene be expected to be formed in greater amounts
Multicellular animals have some mechanism to control cell mass that we do not understand; for in case, salamanders of different ploidies are the same size such that a haploid, a diploid, and a pentaploid organism are about the same size.
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Discuss why do you need to have a smaller sample volume for river water and raw sewage compared to drinking water to do the coliform bacteria test?
Suppose you are a director of a ballet theater. After reading a book about the cell cycle, you are intrigued by the similarity between your night show and the cell cycle.
Phenylketonuria is an autosomal recessive genetic disorder. The frequency of homozygotes with this disorder is 0.0001. Determine the allele frequency for the dominant allele?
Define anterograde axoplasmic transport. Explain why is this type of axonal transport necessary in most neurons? briefly explain molecules involved in facilitating anterograde transport.
Estimate how many photons of light are minimally required to build one glucose molecule in photosynthesis and describe your answer
Which of the following is not a means of decreasing stroke volume? A. loss of 3 pints of blood B.allergic reaction to a bee sting C.increasing aldosterone secretion D.dehydration E.severe vomiting
Why can prakaryotes quickly re infect a patient if they are not wiped out? How may this result in the evolution of drug resistant pathogens.
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