Explain how to determine if a nondisjunction occurred during meiosis I or meiosis II and what the genetic consequences are for the resulting fertilized gametes
What will be an ideal response?
If nondisjunction occurs in meiosis I, all gametes will be abnormal and carry either both members of a chromosomal pair or neither member of the pair. Nondisjunction in meiosis II produces 50% normal haploid cells and 50% abnormal cells, one with an extra copy of a chromosome and one missing a chromosome. Fertilization between gametes with an extra copy of a chromosome and a haploid gamete will result in trisomy; fusion of a haploid gamete and one missing a copy of a specific chromosome will result in monosomy. The phenotypic effects of aneuploidy range from minor physical symptoms to devastating and lethal conditions. Among survivors, phenotypic effects often include behavioral deficits and intellectual disability.
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A muscle precursor cell expressing the MyoD1 gene would be considered to be
A. pluripotent. B. determined. C. differentiated. D. totipotent. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about determination and differentiation? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The function of myoglobin in muscle cells is to _____________
Fill in the blank(s) with the appropriate word(s).
What selective pressures are likely to have led to the evolution of regulatory systems like operons? Why not simply express these genes continuously?
What will be an ideal response?
The type of bone tissue that is found in the middle portion of a long bone and has lacunae arranged in concentric circles around central canals that contain blood vessels and nerves is
A. yellow marrow. B. red marrow. C. spongy bone. D. compact bone. E. fibrous membrane.