The probability of a couple having either a boy or a girl is ½. However, many families have more boys than girls and VICE VERSA. Why is the observed ratio of boys to girls in typical families different than the predicted ratio?
A. There is a large random sampling error due to the small size of families.
B. There is a small random sampling error due to the small size of families.
C. Humans are more heterozygous than is predicted by random sampling.
D. The sex of each child is determined independently.
E. Two of the answers are correct. There is a large random sampling error due to the small size of human families and the sex of each child is determined independently.
E. Two of the answers are correct. There is a large random sampling error due to the small size of human families and the sex of each child is determined independently.
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A cell biologist produces a karyotype of mouse somatic cells arrested in mitosis. She sees 40 chromosomes, which is completely normal for mice. Based on this information, what is the haploid number of chromosomes for mice?
A. 10 B. 20 C. 40 D. 80 E. It cannot be determined from the information provided 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 know about diploid cells? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? 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?
Cloned B cells which produce antibodies that are specific to a particular antigen are called _______ cells.
Fill in the blank(s) with the appropriate word(s).
Transgenic bacteria are bacteria:
a) that have a sequence of DNA from another organism inserted into them. b) found in the DNA of other organisms. c) that have transformed their DNA. d) that have hybridized with other species of bacteria. e) that produce genes used in recombinant DNA technology.
Which of the following statements about eukaryotic activator proteins is false?
A. They stimulate transcriptional initiation by opening up the double helix. B. They stimulate transcription initiation by promoting the assembly of a transcription initiation complex at the promoter. C. They stimulate transcription initiation by aiding in the assembly of general transcription factors and RNA polymerase at the promoter. D. They stimulate transcription initiation by recruiting proteins that modify chromatin structure.