Using traditional cross-breeding techniques, scientists have been able to create featherless chickens. Which situation has not been a problem with featherless chickens?
A) Featherless chickens are unusually vulnerable to mosquito attacks.
B) Featherless chickens are unusually vulnerable to parasites.
C) Featherless chickens have difficulty mating.
D) Featherless chickens are ultra-sensitive to sunlight.
E) Featherless chickens have trouble digesting corn.
E) Featherless chickens have trouble digesting corn.
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Some animals have evolved sexual maturity in juvenile body forms. This is called ____
a. allometric growth b. vicariance c. paedomorphosis d. punctuated equilibrium e. convergence
Which strains' mutations represent a complementation group?
Fruit flies normally have red eyes. Seven different true-breeding strains of fly with white eyes have been identified (A-H). In each strain, the white eye trait is due to an autosomal recessive allele. It is possible that all seven strains have mutations in the same gene. Alternatively, some or all of the strains may have mutations in different genes. To determine how many genes are involved in eye color in these flies, all possible pairwise crosses are performed. The offspring phenotypes resulting from each cross are observed. (+ = wild-type; ? = mutant)
A) C, D, F
B) A, B
C) E
D) A, B, E, G, H
A child has a bicycle accident and is rushed to the ER. The doctors stop the bleeding, but the child needs a transfusion. Fortunately, the patient is AB-positive, so the doctors can give him ________
A) AB negative or positive only B) any blood type C) O positive only D) O negative only
A population's intrinsic rate of increase can be calculated by:
A) multiplying r by K. B) subtracting r from K. C) multiplying r by the initial population size, N. D) subtracting birth rate from death rate.