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a. There are dominant mutations of the Sxl gene, called SxlM alleles, that transform XY animals into females but do not affect XX animals. Reversions of these SxlM alleles can be readily induced with mutagen treatment. These reversions, called Sxlf alleles, yield normal individuals in XY animals, but, in homozygotes, they transform XX animals into phenotypic males. Provide a possible explanation for these observations, keeping in mind that Sxl is ordinarily dispensable for male development.
b. XYY humans are fertile males. XXX humans are fertile females. What do these observations reveal about the mechanisms of sex determination and dosage compensation?
c. You have cloned a piece of DNA that contains four genes. How could you use the spatial-expression pattern of their mRNA in a wild-type embryo to identify which represents a candidate gene for the mutation in a pair-rule gene?
Did the amplitude of the action potential in median giant axon vary with stimulus voltage? What is the physiological basis for your answer?
In the fruit fly Drosophila, a rudimentary wing called "vestigial" and dark body color called "ebony" are inherited at independent loci and are recessive to their dominant wild-type counterparts, full wing and gray body color. Dihybrid wild-type m..
Use a punnet square to predict the ratio, however, id rather be able to do this mathematically if someone can explain.
Why should blood pass through the liver after leaving the digestive system and before entering the other organs?
You have identified a mutation in yeast, a unicellular eukaryote, that prevents the polyadenylation of the 3' end of RNA transcripts. However, there is no mutation in the enzyme that catalyzes the addition of A's or in the enzyme that cleaves the ..
Which lower vascular plant group once had tree-sized individuals (ca. 250- 300 mya) in swampy areas; their fossilized remains became a significant part of most coal deposits in the US.
Why you think scientists probably want to leave what they do open to revision.
Draw the metabolic pathways for Glycolysis, the Krebs cycle, and the electron transport chain. Indicate at the right the total number of ATP and NADH produced or consumed.
Provide examples of the following prezygotic barriers to reproduction: Temporal isolation, Habitat isolation, Behavioral isolation, Mechanical isolation, and Gametic isolation.
Analyze the contributions of select scientists from the Greek and Roman period. Explain the Arab influence on the development of anatomy and physiology.
how to express the number of types of gametic chromosomal.
Draw a drop of blood from the aorta to the skin of the face and back to the right atrium. Comprise, in order, the main arteries and veins.
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