9 & 14 Flashcards
(15 cards)
What does DNA polymerase do during DNA replication?
Adds nucleotides to the 3’ end of a growing DNA strand.
Which of the following is NOT a checkpoint function in the cell cycle?
Cytokinesis involves the formation of a cleavage furrow to separate the cells.
Which part is NOT included in the mitotic spindle apparatus in plants?
Centrioles
Correct order of mitotic events: IV-condense, I-align, III-nuclear envelope breaks, V-separate, II-cleavage.
IV, III, I, V, II
In haploid-dominant species, what is true?
The multicellular organism is haploid and only the zygote is diploid.
What is the result of nondisjunction of all chromosomes in meiosis I?
Two polyploid gametes, each with an extra set of chromosomes.
Why do sexually reproducing organisms alternate between haploid and diploid?
To prevent doubling of chromosomes each generation.
What is produced from unequal crossing over in meiosis?
A deficiency in one homologue and a duplication in the other homologue.
What is the role of bivalent formation in meiosis?
Contributes to genetic diversity of a species.
At the end of meiosis I, are cells haploid or diploid?
Cells are haploid.
Which mutations do NOT change the amount of genetic material?
Inversion
What does meiosis I and II produce?
Meiosis I: two haploid cells, Meiosis II: four haploid cells.
When do sister chromatids separate during meiosis?
Anaphase of meiosis II
If a species has 3 sets of homologous chromosomes, how many combinations can it produce?
8
Which of these is NOT true about the G1 phase?
If environmental conditions are favorable, G1 cyclins are degraded.
