12. Knockout mice are genetically engineered organisms in which scientists have nullified a gene of interest. The targeted gene no longer functions correctly in the mouse, and scientists can use these mice in their genetic research. What information is most likely provided to scientists through the study and use of knockout mice? A Scientists can create new breeds of mice by altering the mouse genome
B Genetic researchers can better understand the purpose of specific genes
C Biochemists can practice techniques for inserting fluorescent proteins into mice
D Biologists can increase the amount of recessive traits present in the mouse population

Many birth-control pills release a constant amount of synthetic estradiols and progesterone for 21 days, followed by 7 days when no hormones are ingested. which of the following statements most accurately describes the effects of birth-control pills? -birth-control pills maintain constant levels of estrogens and/or progesterone so there is no surge in lh and ovulation does not occur.-birth-control pills inhibit the development of the uterine lining so implantation of a fertilized oocyte cannot occur.-birth-control pills maintain constant levels of estrogens and/or progesterones and mask the release of the oocyte from the follicle.-the 7 days with no hormones does not allow a thick enough uterine lining to form so a fertilized oocyte cannot implant.