HIS4 trp1; HIS4 trp1; his4 TRP1; his4 TRP1
A haploid yeast strain has mating type a and genotype his4 TRP1. A different haploid yeast strain has mating type ? and genotype HIS4 trp1. The two strains mate and produce diploid offspring with genotype his4 TRP1 / HIS4 trp1. The diploid cells undergo meiosis to produce a variety of tetrad types. In the following questions, the genotypes of the spores in a tetrad are shown. For each tetrad, tell what type it is: parental (PD), non-parental (NPD), or tetratype (T).
A) PD
B) NPD
C) T
D) cannot be determined
A) PD
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The finding that homeotic genes are present in both mammals and insects indicates that these genes must
A. control the same traits. B. be on the same chromosomes. C. have arisen very early in the evolutionary history of animals. D. have developed independently and simultaneously. E. have been transmitted into mammals by an insect bite. 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 homeotic genes? 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?
All EXCEPT which of these is an echinoderm?
a. sea star b. brittle star c. sea anemone d. sea urchin e. sea cucumbers
Crossing over takes place during
a. early prophase 1 of meiosis only b. middle prophase 1 of meiosis only c. both prophase 1 and prophase 2 of meiosis d. interphase
The purpose of transport medias to
A. protect the swab from moisture B. make sure the microorganisms can multiply C. take the place of plating a routine culture with the specimen D. not promote the multipliation of microorganisms but enrure their preservation