HUMAN ANATOMY + PHYSIOLOGY + MAST AP
HUMAN ANATOMY + PHYSIOLOGY + MAST AP
11th Edition
ISBN: 9780136782056
Author: Marieb
Publisher: INTER PEAR
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Chapter 14, Problem 5CCS

10-Year-Old Boy with Spinal Injury

On arrival at Holyoke Hospital, Jimmy Chin, a 10–year-old boy, is immobilized on a rigid stretcher so that he is unable to move his head or trunk. The paramedics report that he was awake and alert after his accident at the skateboard park, but crying and complaining that he couldn't get up and that he had a “wicked headache." He has severe bruises on his upper back and head, and lacerations of his back and scalp. His blood pressure is low, body temperature is below normal, lower limbs are paralyzed, and he is insensitive to painful stimuli below the nipples. Although still alert on arrival, Jimmy soon begins to drift in and out of unconsciousness.

Chapter 14, Problem 5CCS, 10-Year-Old Boy with Spinal Injury

On arrival at Holyoke Hospital, Jimmy Chin, a 10–year-old boy,

Jimmy is immediately scheduled for a CT scan, and an operating room is reserved.

Relative to Jimmy's condition:

Two days after his surgery, Jimmy is alert and his MRI scan shows no residual brain injury, but does show pronounced swelling and damage to the spinal cord at T4. On physical examination, Jimmy shows no reflex activity below the level of the spinal cord injury. His blood pressure is still low.

5. Why are there no reflexes in his lower limbs and abdomen? Why is his blood pressure low?

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Question #3: In the KeyGene paper, the authors state that it would be useful if pollen from an apomict would transmit apomixis-inducing genes to the female in the cross (assuming the pollen is viable). Assuming there was just one gene conferring gametophytic obligate apomixis, and that the two parents are inbreds, what would be the consequences of such a cross if: a) The apomixis was a dominant trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the parental cross. b) The apomixis was a recessive trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the…
Question #5: Assume that two genes are identified that confer gametophytic facultative apomixis in soybean. The genes show independent assortment. Recessive alleles at both loci are required for the facultative apomixis. Facultative apomixis is triggered when the temperature at pollination is above 20 degrees C. At temperatures below 20 degrees C, all reproduction is sexual, independent of genotype. A facultative apomict male, capable of producing viable pollen, was crossed with a sexually reproducing female. Assuming the parents are completely inbred, what are the predicted phenotypic ratios (apomict: non-apomict) for the F1, F2, and DH (F1-derived) generations at each of the following temperatures*: a) 15°C? b) 25°C? *for full credit, show crosses and genotypes where appropriate. Remember to position the female first (left side) in the cross. Type your answer here:
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