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Q1. A group of researchers studied variation in the number of abdominal bristles in female Drosophila. Two inbred strains that differed in bristle number were crossed to produce F1 hybrids. The variance in bristle number among the F1 flies as 3.33. These F1 flies were intercrossed with one another to produce an F2 population, in which the variance in bristle number was 5.44.
Q2. Two pure-breeding lines of Jersey cattle have mean weekly milk yields of 60 and 210kg. The F1 generation, which resulted from cross between the two lines, has a mean of 135kg and a variance of 16kg. What is the broad sense heritability (H2) for milk yield in this population?
Suppose that P is always completely dominant to any number of p's, and that the locus is close to the centromere. What is an expected ratio of purple:white in the progeny of the next crosses.
What is estimated density of firs in the forest. Why then is the gene called Dorsal, and not, for instance, Ventral.
Spatially explicit model shows no evidence of admixture between Eurasians and Neanderthals
What are genotypes of all the individuals mentioned in this difficulty. What is the point of the agar dish not treated with X-gal.
Batch and continuous sterilisation
If a maize plant is heterozygous for the alleles for pigmy and crinkly-leaf (both recessive to normal size of plant (S) and normal leaf (L) is self pollinated and 208 seeds are subsequently collected and germinated, how various would you expect to sh..
What part of the sewage treatment plant deals with insoluble and complex organic wastes? Which molecule contains more energy, X or Y.
What defence was successful in preventing you from grab the snake. While travelling in Texas, you stumble across a snake with red, yellow, and black bands.
If the centrioles are mispositioned in the cell, the functional mitotic spindle would fail to form. In this state, how will chromosome segregation be affected . Microtubules will not attach to kinetochores.
Frank found himself in the midst of an ethical dilemma at work, and was using an ethical decision-making matrix, to address his work and personal values. Frank was most likely in which phase of the Ethical Decision-Making Framework.
Cyanobacteria grow prolifically in streams and lakes with low oxygen levels and high nutrient concentrations. How may the presence or absence of cyanobacteria be used as an index of pollution in lakes.
Assume that there are 63 different naturally occurring amino acids. If all 64 possible combinations of bases for a codon resulted in coding for 63 different amino acids and one stop codon, which of the next mutations would NOT be possible.
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