Unformatted text preview: Bio305 Genetics Exam I (A). Fall 2018
I, House fly has 2n-12 chromosomes in somatic cells, How many chromosomes exist in a primary
oocyte, a secondary cocyte, and an ovum?
a) 12, 6, and 6
b) 12. 12, and 6
() 24, 12, and 12
d) 12, 6, and ]
2) 24, 12, and 6
2, In a diploid organism with 20 = 4 chromosomes, how many bivalents and tetrads are expected to
form during the prophase I of meiosis?
a) 4 bivalents, 4 tetrads
b) 2 bivalents, 2 tetrads
() 8 bivalents, & tetrads
d) 4 bivalents, 2 tetrads
e) 2 bivalents, I tetrad
3, Which statement about chromosomes and cell divisions in humans is CORRECT?
a) Centromeres rarely exist in plant chromosomes.
b) The complexity of an organism increases with its number of chromosomes.
c) P53 regulates cell cycle and is known as a tumor suppressor gene because tumors are suppressed
when P53 is mutated.
d) Second-division nondisjunction is due to nondisjunction of homologous chromosomes in the second
cl The long arm of a chromosome is commonly referred to as the q arm.
4, Which statement about the history of genetics is INCORRECT?
a) Thomas Morgan is widely regarded as the father of genetics,
b) Alfred Sturtevant, a student of Thomas Morgan, produced the first genetic map.
c) Calvin Bridges, a student of Thomas Morgan, used nondisjunction to demonstrate that genes are
located on chromosomes.
d) In honor of Thomas Morgan, geneticists refer to I mu as I centimorgan.
e) Mendel's laws of inheritance were independently rediscovered by three scientists in 1900....
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