test #3 Flashcards
an adipocyte is a type of fat storage cell that, once fully differentiated, no longer divides. fully differentiated fat cells are in which phase of the cell cycle?
G0
after chromosomes condense, the __________ is the region where the identical DNA molecules are most tightly attached to each other?
centromere
the diploid number of chromosomes in the mustard plant is 10. knowing this, how many chromatids will be present in a plant pollen cell at the end of metaphase I of meiosis?
20
which of the following is NOT true about cohesin?
a. is a 6-subunit hexametric protein complex
b. coats sister chromatids along entire length
c. holds sister chromatids together
d. has its highest concentration at centromeres
a
which cell cycle checkpoint can be passed only if the cell size is large enough, nutrient availability is sufficient, and growth factors are present?
a. zygotene checkpoint
b. S-phase checkpoint
c. G1/S checkpoint
d. G2/M checkpoint
e. metaphase checkpoint
c
prior to meiosis, a pre-oocyte cell has the genotype AaBBCcDd. what is the predicted frequency of a fully formed gamete (egg) with he genotype aBCd from this cell?
1/8
in a dihybrid cross between 2 heterozytogtes, you expect to observe 9:3:3:1. you observe 9:6:1 instead. which type of epistasis has occurred?
a. dominant suppression
b. dominant epistasis
c. recessive epistasis
d. dominant gene interaction
e. complementary gene action
d. dominant gene interaction
during which phase of prophase I does crossing over between non-sister chromatids begin?
pachytene
which of the following is correct regarding ind. who are blood type B?
a. express A-transferase that adds N-acetylgalactosamine to the H antigen
b. carry both anti-A/B antibodies
c. blood cells would climb when receiving blood from genotype IBi
d. express B-transferase that adds galactose to H antigen
e. cells carry the A/B antigens
d
in humans, ind. w/ green eyes carry mutations on chromosome 15. they cause a reduction of melanin production below that of the normal brown eyes, but above that of those with blue eyes where no brown pigment is made. how is this mutation classified?
a. hypomorphic
b. hypermorphic
c. dominant negative
d. neomorphic
e. null
a. hypomorphic
the diploid number of chromosomes in the mustard plant is 5. how many chromatids will be present in a plant pollen cell at the end of metaphase I of meiosis?
10
prior to meiosis, a pre-oocyte cell has the genotype AaBbCcDd. what is the predicted frequency of a fully formed gamete (egg) with he genotype aBCd from this cell?
1/16
a mutation that encodes phospholipase causes a dominantly inherited auto inflammatory disease. leads to increased activity of the PLC enzyme and excessive inflammation. what kind of mutation?
a. hypomorphic
b. hypermorphic
c. dominant negative
d. neomorphic
e. null
b. hypermorphic
coat color in horses/cattle shown below. if a true breeding white horse was bred with a true breeding red horse and the resulting color is roan, what kind of inheritance?
codominance
