In a test cross, a pure-breeding plant is crossed with a plant suspected to be heterozygous (Aa). What is the genotype of the pure-breeding plant?
What will be an ideal response?
aa
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Fluzone is a brand name for a very commonly given influenza vaccine. The vaccine is prepared by first harvesting flu viruses in chicken embryos and then breaking apart virus particles into protein subunits, thereby inactivating the virus. Your friend refuses to get the vaccine. Which of these statements is the only valid reason for her not to get the flu vaccine?
A. She could die from the vaccine. B. She could pass the virus onto her baby, causing the child to become autistic. C. She could catch the flu from the inactivated vaccine. D. She is allergic to eggs.
Analyses of molecular sequences for study of evolutionary relationships are constrained by ____
a. the fact that every base in a nucleic acid serves as a separate, independent character for analysis b. the presence of many genes that have been conserved by evolution c. the limited number of nucleotide characters, making it difficult to determine whether genetic similarities between species are homoplastic or homologous d. the usefulness of genes for studying only closely related species that have minor morphological differences e. nucleic acids that are not directly affected by the developmental or environmental factors that cause nongenetic morphological variations
China's population control policies have
resulted in a(n) a. sharp decrease in its total fertility rate. b. shift in its gender ratio. c. increase in the abortion of female fetuses. d. ratio of 1.19 males for every female. e. all of these
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.