Which of the following statements is true?
a. In carriers, the recessive allele causes an intermediate phenotype.
b. With recessive genetic disorders, if both parents are carriers, the offspring will all be affected.
c. In recessive genetic disorders, the mother and/or father of an affected individual must also be affected.
d. With dominant genetic disorders, the mother and/or father of an affected individual must also be affected.
e. The dominant allele is masked in homozygous dominant individuals.
D
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If a pollen grain fails to generate two sperm cells, what is the most likely result of pollination?
A. Half the seeds would develop fine, but the other half would die. B. The resulting progeny would be haploid. C. The seeds would lack either embryos or endosperm, and so would be nonviable. D. The endosperm would be smaller. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about plant gametes and fertilization? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Positive feedback control occurs
A) during maintenance of proper body temperature. B) when insulin and glucagon regulate blood glucose levels. C) during the process of childbirth (labor). D) to counter the effects of negative feedback. E) in other animals but not in humans.
Epinephrine, norepinephrine and dopamine are all synthesized from the amino acid tryptophan.
a. true b. false
Immature B lymphocytes undergo clonal deletion in the bone marrow.
Answer the following statement true (T) or false (F)