The factors that tend to reduce the size of a
population regardless of its initial size are
a. density-dependent factors.
b. density-independent factors.
c. ecological factors.
d. biotic factors.
e. species-independent factors.
Answer: b
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You are working in a research lab on the organism Drosophila melanogaster and you have been given
the job of determining the relative positions of three linked genes for your undergraduate research project. A graduate student in the lab tells you that gene a is 5.0 centimorgans from gene b, and that gene c is 2.7 centimorgans from gene b. What should you do to finish mapping these three genes? What are the likely results that may occur, and how would you interpret such results?
What will be an ideal response?In sperm formation, when does mitosis take
place?
a. after the formation of the haploid immature sperm b. between formation of the primary and secondary spermatocyte c. between formation of the secondary spermatocyte and the immature sperm d. between the male germ cell and the primary spermatocyte formation e. after the mature sperm is formed
Maternal effect genes of Drosophila are genes active in ____ cells, whose products establish ____ in developing
embryos. a. maternal; gender b. maternal; polarity c. embryonic; polarity d. embryonic; gender e. egg; gender
How do Parkinson's causing aggregates enter unaffected cells?
A) alpha-synuclein aggregates cannot enter unaffected cells B) phagocytosis C) exocytosis D) endocytosis