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A Drosophila researcher has recently isolated a number of mutant fruit flies. The phenotype of each mutant is described below (i–iv). For each mutant, describe the type of gene (maternal-effect gene, gap gene, segment-polarity gene, or homeotic gene) that was most likely the cause of the altered phenotype. Briefly explain your answer(i) Homozygous mutant females appear phenotypically normal but produce larvae that have two posterior ends.(ii) The flies contain four wings rather than two.(iii) The wings are oriented backward.(iv) The flies are missing two pairs of legs due to a shortened thoracic region
If the VE of a trait decreases, what happens to the narrow-sense heritability? Explain your answer in terms of the equation VP = VA + VD + VI + VE + VGE
What is the genotypic and phenotypic ratio of the offspring produced when you cross a round squash with an oval squash?
explain why different people perceive pain both biological and psychological differently. why is pain difficult to
questions1. what are the benefits of genetic engineering versus the potential risks?2. what are your personal thoughts
A project is underway to develop a vaccine against mouse hepatitis virus, a pathogen of mice. The vaccine consists of capsid protein of the virus, which is injected subcutaneously as a depot in alum on day 0. At days 5 and 14, the group of six mic..
Hemophilia is caused by an X-linked mutation in humans. If a woman whose paternal uncle (father's brother) was a hemophiliac marries a man whose brother is also a hemophiliac, what is the probability of their first child having hemophilia (assume ..
Transformation, conjugation, and transduction were discovered in the laboratory. How important are these mechanisms of genetic recombination in nature.how is electrophoresis used in criminal forensics.
Nearsightedness is dominant to normal vision and hazel eyes are dominant to blue eyes. A nearsighted woman with hazel eyes who is heterozygous for both traits marries a man with normal vision and hazel eyes.
q1. a group of researchers studied variation in the number of abdominal bristles in female drosophila. two inbred
Describe how information is carried down the pathway of a motor neuron, starting at an axon hillock, continuing down the axon, across the synapse, through another nerve, across the neuromuscular junction. End with the action potential in the muscl..
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.
q. trace your path from the right femoral vein to the lowest lobe of the right lung via the right pulmonary
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