The siphuncle of nautiloids is used for:
a. regulating respiration rate.
b. providing propulsion.
c. regulating water and gas content within the chambers.
d. capturing food.
e. reproduction
C
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Einkorn (Triticum boeoticum) is an ancient grain with a diploid number of 14 (2n = 14). Durum (Triticum turgidum) appeared later. Durum grains are larger and the plant is hardier
It has twice the genetic material of Einkorn (2n = 28 ) but contains basically the same chromosomes. Can you propose a hypothesis on how durum evolved?
Which of the following is one of the hallmarks of a cell?
A. Presence of Cell Wall B. Presence of Nucleus C. Extra-Cellular Living D. Self replicating
Migration occurs when individuals move between populations. Considering a single pair of alleles, A and a, what formula is used to indicate the new frequency of A in one generation of migration?
What will be an ideal response?
Errors in meiosis can be one mechanism of evolution. A change in the number of chromosomes can lead to the production of new species. Some plant species may have originated from errors during cell division, which led to them having more than two sets of
chromosomes, a condition called polyploidy. Hypothesize what kind of error during meiosis might occur to cause a normally diploid plant to generate tetraploid offspring, in which the offspring have four sets of chromosomes. What will be an ideal response?