In humans, an X-linked disorder called coloboma iridia (a fissure in the iris) is a recessive trait. A normal couple has
an afflicted daughter. The husband sues the wife for divorce on the grounds of infidelity. Would you find in his favor? What will be an ideal response?
ANSWER: Yes, the daughter would have to inherit the recessive trait from both parents and since the
husband is normal and has only one X to give, the daughter could not have gotten the
recessive allele from him.
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Match the following items with the correct phrases.
_______1. Organisms that live on dead and decaying organic matter are said to be __________. _______2. The type of relationship that termites have with the cellulose-eating protozoa that live in their intestinal tract. _______3. A symbiotic relationship that is beneficial to both parties (symbionts) is said to be a __________ relationship. _______4. A lichen is an example of a __________ relationship. _______5. A symbiotic relationship that is beneficial to one party (symbiont), but of no consequence to the other is said to be a __________ relationship. _______6. The type of relationship that humans have with the Escherichia coli organisms that live in their colon. _______7. A symbiotic relationship that is beneficial to one party (symbiont), and detrimental to the other is said to be a __________ relationship. a. commensalistic b. mutualistic c. parasitic d. saprophytic e. synergistic
In the light-independent reactions of photosynthesis, CO2 is added to a five-carbon molecule known as
A. cellulose. B. CAM. C. ribose. D. RuBP. E. deoxyribose.
Which statement is false?
A) Stalks of celery are the petioles of the plant. B) White potatoes are modified plant roots. C) A carrot is an example of a taproot. D) The layers of an onion are actually modified leaves.
You are observing the embryonic development of a new species in your laboratory. This species has indeterminate development. You note a mutation in which one of the blastomeres (early cells) mutates and loses its function. What do you hypothesize would happen to this being?
A. Uncertain future for the embryo-depending on which blastomere was lost, the remaining blastomeres might accommodate the formation of the necessary structures of the embryo. B. Immediate embryo death-the remaining blastomeres could not accommodate the formation of the necessary structures of the embryo. C. Nothing-the remaining blastomeres would accommodate the formation of the necessary structures of the embryo. D. The embryo would certainly lack some features as a result of the lost blastomere.