The amniote egg, in which an embryo could develop completely on dry land, arose during the _____ period.
A. Cambrian
B. Ordovician
C. Devonian
D. Silurian
E. Permian
E. Permian
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To use a backcross mating strategy for QTL mapping
A. two inbred parental strains that differ in a quantitative trait are crossed are mated B. the F1 offspring are crossed with each other. C. the F2 offspring must contain chromosomes that are recombinant betweeen the markers and the genes involved in the trait D. each parent should contain the same alleles at each QTL.
Recombination is defined as the:
a. change of the bacterial genotypes through the exchange of DNA from one cell to another. b. internal change in the original nucleotide sequence of a gene or genes within an or-ganism's genome. c. process by which genetic elements such as plasmids and transposons excise from one genomic location and insert into another. d. uptake of free DNA from the environment and recombination with the recipient's homologous DNA.
Which of the following deliver oxygen-poor
blood to the right atrium?
a. vena cavae b. pulmonary artery c. pulmonary vein d. aorta e. left atrium
What is a secondary endosymbiont and how are they related to algae?
What will be an ideal response?