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Q1. In birds, sex is determined by the ZW chromosome scheme. Males are ZZ and females are ZW. A recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. What will be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female?
Q2. A mammal uses only one to two percent of its energy in ventilation as a fish must spend about 15 percent of its energy to move water over its gills. Explain this huge difference in their efforts to collect oxygen.
In mid afternoon, they are on it's under surface, each caterpillar hanging by a few legs. Offer a hypothesis to explain this behaviour. How would you test it.
Imagine that non disjunction occurred throughout the production of the egg cell that produced your dragon's baby and resulted in no sex chromosome in the sperm cell. How would this change phenotype of your dragons' baby? Be exact for each trait that ..
At the present we know that over 99 percent of the time, glucose occurs in the closed-ring form. What likely difference between these forms would give chemists a clue that the open-chain form was not present.
If the mutation is in mitochrondrial DNA, will the four haploid cells probably be all Pyr-, all Pyr+, or a combination? What if the mutation is in nuclear DNA. Why is mitochondrial function critical for growing on pyruvate.
Describe the structure of atp and gtp. Describe how atp is produced during chemiosmosis. Illustrate two specific cellular processes that require atp and explain how atp is used in each process.
Plan a scientific experiment to find out the effect of this environmental factor on the rate of photosynthesis or cellular respiration in your chosen organism (reviews the scientific method, remember hypothesis, control so on.
Which of the follow was necessary to this confirming experiment. Phosphorus is not present in amino acids in the protein coat of phage.
Why does some scientist think that areas protected from the otmosphere might have favoured the production of organic compounds on early earth.
After a long scuba diving session on a Caribbean reef, David boards a plane to Denver. He begins to feel pain in his elbows on a flight back home to Denver.
In maize, a dominant allele (A) is essential for seed color as opposed to colorless (a). Another gene has a recessive allele (w) which results in waxy starch, as opposed to normal starch (W).
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.
The idea is that this arrangement will allow animals and plants to migrate between refuges. Why will such migration be important. Which of the compounds that normally protects the liver and other vital organs.
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