What would result if too many cells left the surface of the embryo to move inside during gastrulation?
A. Too little protoderm, resulting in missing organs
B. Problems in muscle development
C. Too little ectoderm, resulting in missing nervous system or skin
D. Too little endoderm, resulting in missing gut and organs
Answer: C
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Answer the following statements true (T) or false (F)
1) If the p value corresponding to a given ?2 value and number of degrees of freedom is lower than 0.05, then the null hypothesis is rejected and it can be said with some confidence that the two genes being evaluated are linked. 2) Genes that are not syntenic are not linked. 3) The genetic distance from one end of a linkage group and the other may exceed 50 m.u. because the distances between many gene pairs are added together to make the map. 4) Sectors with a different phenotype in an otherwise uniform yeast colony may be evidence of mitotic recombination. 5) Large sectors suggest a mitotic recombination event late in the growth of a yeast colony. 6) A coefficient of coincidence of 0.5 in a region of three genes means that half as many double crossovers were observed as would have been expected if crossovers in the two intervals were independent.
__________ are single-celled and mostly or entirely
heterotrophic. Fill in the blank(s) with the appropriate word(s).
Dominance, sexual behavior, and territoriality can all be related in song birds. This is because:a
the establishment of a territory by singing tends to reduce conflict. b. the establishment of a territory encourages use of the entire habitat and regulates the size of the breeding area. c. competing species are eliminated. d. only individuals that successfully defend their territory can mate. e. females sing but males do not.
Suckling is an innate behavior in mammals
Indicate whether the statement is true or false