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Question 1: Embryonic chickens are a favorite organism in developmental biology research because they are very similar to mammalian embryos. Chick embryo somites form along the neural tube a couple of days after putting a fertilized egg into a warm incubator or being cared for by a hen. The somites are visible for 4 or 5 more days before their cells disperse to produce various kinds of tissues like skeletal muscle, bone, or connective tissue. If cells are taken from a somite soon after it is formed and transplanted into a different region of another somite, the transplanted cells form whatever tissue is 'supposed to be' formed by that somite region: cells taken from a muscle-forming region of one somite and put into a bone-forming region of another somite will form bone, not muscle. But, if one waits a couple of days after somite formation to take cells for transplantation, the older somite cells always form the kind of tissue specified by the region of somite from which the cells were taken: cells from a muscle region will still make muscle tissue even when transplanted into a bone-forming region. What could have happened to the later-transplanted cells that kept them from forming bone and ensured they formed only muscle?
Question 2: An 8-cell frog embryo can be separated into its individual cells and those cells placed in incubators with all the necessities for development. Each cell can divide and produce more cells but none of the cells can produce anything resembling a normal tadpole. Mouse 8-cell embryos can be separated into individual cells and those cells individually re-implanted into a female uterus. Each of the cells can produce a complete, normal embryo and ultimately a normal mouse. Why can mammals be cloned this way while amphibians cannot?
How does this neurotoxin affect the nervous system's ability to stimulate skeletal muscle contraction? How does it affect the capability of skeletal muscle fibers to respond to stimulation.
An amphibian that lives in a swamp has thirty fold more DNA than a human who lives on the forty-eight floor of luxury apartment apartment complex.
How may someone become hyponatremic in a country where the salt content of food is generally very high. What about the function.
In the telophase stage of mitosis, microtubules gather along the cell's equator. The purpose of these microtubules is to what.
Assume n-butylmalonate is added to an aerobic suspension of kidney cells using glucose exclusively as fuel. Predict, with description, the effect of this inhibitor on.
The two largest marine predators are killer whales and big sharks such as great whites. Suppose that a killer whale and a great white shark of the same size and weight are capable of swimming at the same maximum velocity
An experienced goldfish breeder receives two unusual male goldfish. One is black rather than gold and other has a single fail fin rather than a split tail fin.
Critically explain the environment and outcome of the environmental problems, the strategies and factors which affect the environment and prevention of the environmental strategies with the graphical explanation.
A series of two-point crosses among fruit flies is carried out between genes for brown eyes, Use the data from two-point crosses and create a genetic map for these genes.
Assume you were given fifty ml of sewage and asked to determine the number of bacteria in the sample. You began by taking five ml and putting it into 45 ml of sterile water.
Here are the distances between adjacent pairs of loci. A map distance of fifty = independent assortment. Please map genes giving distances between adjacent pairs of loci.
A blue-eyed man marries a brown-eyed woman; and they have six children, all brown-eyed. What is the most likely genotype of the father?
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