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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.
The lycophytes, sphenophytes, and ferns were once the giants of the plant kingdom and dominated the landscape. Explain why they are presently restricted to certain habitats and are relatively small in stature.
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For the latter, you find that the usual nucleotide T is often replaced by C and therefore you are suspicious that there is a significant association.
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He lacked the proper instruments for determining Na+ concentrations, but was rather certain that no other major ions were present in the ECF and ICF. Can you calculate either concentration for him? (Show all calculations)
Genes A, B, and C are linked on a chromosome and found in the order A-B-C. Genes A and B recombine with a frequency of 8%, and genes B and Crecombine at a frequency of 24%.
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Membrane bound and free ribosomes, which are structurally and functionally identical, differ only in the proteins they happen to be making at a particular time.
The mythical Eurasian magnetic pinching beetle is able to manufacture and detect subtle variations in local magnetic fields. Male magnetic pinching beetles provide extensive parental care;
A 20-year old man presents with pain and swelling about the left knee for the past month. He thought that this condition resulted from an old football injury and that it would resolve without incedent. The pain however has persisted and is severe ..
A homozygous plant with 20 cm diameter flowers is crossed with a homozygous plant of the same species that has a 40cm diameter flowers. The F1 plants all have flowers 30cm in diameter.
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