What did griffith observe when he injected a mixture of heat-killed, disease-causing bacteria and live harmless bacteria into mice? a. the disease-causing bacteria changed into harmless bacteria. b. the mice developed pneumonia. c. the harmless bacteria died. d. the mice were unaffected.

correct answer is B.

bcz genetic information is transferred to others and mouse get pneumonia.

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c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.