Which of the following statements could explain why BC homozygous birds are unusually small?
Black-cheeked BC zebra finches are extremely desirable, but relatively rare. This phenotype is caused by a recessive mutation, but the mating of two BC birds is considered unethical because it results in very small birds. Therefore, BC birds are created by crossing carriers of the BC gene. Despite problems with the homozygous recessive, some unscrupulous breeders continue to breed them together because of the high prices they fetch.
A. The BC gene causes a mutation in a growth gene.
B. The BC gene and a gene for growth are very close to one another on the same chromosome.
C. The BC gene and a gene for growth are both mutated.
D. The dominant version of the cheek color gene (GC) encodes a gene for normal size.
E. The BC gene and growth gene are close together on the same chromosome and/or both of these genes are mutated.
E. The BC gene and growth gene are close together on the same chromosome and/or both of these genes are mutated.
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Transformation is used in genetic engineering to ____
a. generate bacteria with an F factor for conjugation b. understand how bacteriophages transfer DNA to bacteria c. obtain large quantities of viruses for study d. produce large quantities of the inserted DNA to increase yields of a target product e. introduce new genes into a bacterium’s mitochondrial DNA
Mutations are the original source of new alleles, but may be adaptive, __________ or __________. Fill in the blank(s) with the appropriate word(s)
What are the functions of the products of min genes?
What will be an ideal response?
What is the purpose of an enzyme's 3?–5? exonuclease activity?
a. to unwind the double helix b. to excise incorrectly added bases c. to polymerize DNA d. to repair lesions e. to remove RNA primers