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Q. Imagine that on the other side of the wall surrounding Mendel's garden, he threw left-over seeds.
Consider physiology of peas that he worked with 7 paired traits, that one generation of peas takes one year, and he over his experiments in 1865.
a) How many different combinations of phenotypes could exist of these 7 paired traits?
b) If a pea seed, heterozygous in all 7 loci grows and selfs, what proportion of its seeds will still be heterozygous in every trait?
c) What proportion would be heterozygous in every trait after 2 years?
d) What proportion would be heterozygous in every trait after 139 years?
A number of bacterial biosynthetic operons have been examined in Escherichia coli and Salmonella typhimurium, many of which show attenuation very similar to that seen in the tryptophan system in E. coli.
Explain how a mutation could inhibit the binding of sigma factor to DNA. Describe two specific base substitutions you think would inhibit the binding of sigma factor.
A uniform ladder of length l an weight 100 N rests against a smooth vertical wall. The coefficient of static friction between the bottom of t ladder and the floor is 0.5.
Suppose that 2-pigments, red and blue, mix to give the normal wild-type purple color of petunia petals. Separate biochemical pathways synthesize the two pigments.
Give an example of how a specific virus control the release of its genome so it only occurs at precisely the right point (max 4-5 sentences).
Darwin was wrongly alleged to have said that "man comes from the monkeys." The correct way for a modern biologist to describe the apparent sequence of human evolution.
How is the segmentation in annelids different that the segmentation in tapeworms? (Hint: think about their structures that go across or through segments. Which group do you find those in?)
For seedless vascular plants create a homosporous and heterosporous life cycle of a plant. Also label what structures are haploid and which are diploid as well as when meiosis and fertilization occur.
What is the relationship between infection and the spleen?
When the antifungal agent myxothiazol is added to a suspension of chloroplasts, the PQH2/PQ ratio increases. Where does myxothiazol inhibit electron transfer?
Do different methods of classification all suggest the same phylogenetic history?
what is the functional significance of the decreased amount of cartilage and the increased amount of smooth muscle in the lower respiratory passageway.(larynx)
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