Which of the following is not part of sexual reproduction?
a. The segregation of homologous chromosomes during gamete formation
b. The fusion of sister chromatids during fertilization
c. The fusion of haploid cells from a diploid zygote
d. The reduction in chromosome number during meiosis
e. The production of genetically distinct gametes during meiosis
Ans: b. The fusion of sister chromatids during fertilization
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A diagram of the three domains (Bacteria, Archaea, Eukarya) proceeding from the Last Universal Common Ancestor would show Archaea
A. branching off the Domain Eukarya. B. branching off the Domain Bacteria. C. as the original cells from which the others derived.
A close evolutionary relationship between annelids and mollusks is suggested by the presence of a _____ larva in both phyla as well as by molecular sequence comparisons
A. trochophore B. lophophore C. radula D. bivalve E. none of these
Crossing-over ____
a. only takes place towards the middle of chromatids b. can only occur once for each non-sister chromatid c. can only occur once for each homologous chromosome pair d. only takes place between sister chromatids e. can occur at multiple sites in each set of paired chromosomes
If a plant produces microspores and megaspores, then by definition, it is homosporous
____________________ Indicate whether the statement is true or false.