A breeder of cattle has a herd of white cows and a roan bull. Hair color in this breed is controlled by an incompletely
dominant gene. The two homozygous forms are either red or white, and the heterozygous is roan.
(a) What colors of calves are expected and in what proportions?
(b) Outline a procedure to develop an all-red herd. What will be an ideal response?
ANSWER: (a) 1/2 white, 1/2 roan
(b) Roan with white -- roan, roan x roan -- red, roan x red -- red, red x red -- red
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In the uterus, the ____________________ is shed during menstruation. Fill in the blank(s) with the appropriate word(s)
Binary fission is a form of sexual reproduction in which the daughter cells have a different genetic combination than the parent cell.
Answer the following statement true (T) or false (F)
The dynamic constancy of the internal environment of animals, in which conditions such as temperature, pH, and nutrient concentrations are kept within narrow limits, is termed
A. negative feedback loop. B. the set point. C. osmoregulation. D. homeostasis
Considering that the digestive system is a major route of infection in most human cases of brucellosis, an investigator hypothesizes that the production of urease by the organism plays a key role as a virulence factor as well as in the organism's survival in the upper digestive tract. Indicate all of the following explanations that accurately describe the mechanism of action of the enzyme urease. Select all that apply.
a. As a result of urea hydrolysis, there is an increase in pH due to the production of ammonia. b. As a result of urea hydrolysis, there is a decrease in pH due to the production of ammonia. c. The increased production of ammonia by urea hydrolysis serves to neutralize stomach acid, promoting survival of the organism. d. The increased production of ammonia by urea hydrolysis serves to increase stomach acid, promoting survival of the organism.