Most segmentation genes code for:a
transcription factors.
b. genetic switches such as operators.
c. repressors.
d. insulin-like growth factors.
e. morphogens.
A
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Most domesticated food crops come from which of the following plant groups?
A) mosses B) gymnosperms C) ferns D) angiosperms
Which of the following processes is most likely responsible for many mammals having multiple hemoglobin genes?
a. a reciprocal translocation b. a duplication c. an inversion d. a deletion
In dogs, there is a hereditary deafness caused by a recessive allele, d. A kennel owner has a male dog that she wants to use for breeding purposes if possible. The dog can hear, but the owner is unsure of the genotype. She does a testcross (crosses it to a homozygous recessive dog), and two of the five offspring are deaf. This means that the male dog
A. has the genotype dd. B. is actually deaf. C. has the genotype Dd. D. has the genotype DD. E. is still of unknown genotype since there were offspring of both deaf and hearing phenotypes.
Which of the following prokaryotic cells contain an outer membrane?
A. Gram-negative bacteria only B. Gram-positive bacteria only C. both Gram-positive and Gram-negative bacteria D. archaea E. all prokaryotes