1- About meiosis A. Lasts 74 days in humans B. It is a succession of 2 cell divisions after a single replication of DNA C. Results in the formation of -4 cells with 1 n chromosomes and 2 c quantities of DNA D. is characterized by a chromosomal exchange called crossing-over E. The prophase of the first meiotic division is the longest phase
Question
1- About meiosis A. Lasts 74 days in humans B. It is a succession of 2 cell divisions after a single replication of DNA C. Results in the formation of -4 cells with 1 n chromosomes and 2 c quantities of DNA D. is characterized by a chromosomal exchange called crossing-over E. The prophase of the first meiotic division is the longest phase
Solution
A. False - Meiosis does not last 74 days in humans. The duration of meiosis can vary depending on the species and the type of cell. In human males, meiosis can take up to 23 days, while in females, meiosis begins before birth and can take many years to complete.
B. True - Meiosis is a process that involves two successive cell divisions (meiosis I and meiosis II) following one round of DNA replication. This results in four daughter cells, each with half the number of chromosomes as the parent cell.
C. False - Meiosis results in the formation of four cells (not -4), each with a haploid number of chromosomes (1n) and a single copy of the DNA (1c).
D. True - Crossing-over is a characteristic feature of meiosis. It occurs during prophase I, where homologous chromosomes pair up and exchange segments of DNA. This leads to genetic recombination, increasing genetic diversity.
E. True - The prophase of the first meiotic division is typically the longest phase. It is during this phase that the chromosomes condense and crossing-over occurs.
Similar Questions
2- Meiosis I: A. is characterized by exchanges between homologous chromosomes B. has a prophase lasting 24 hours C. results in cells with n chromosomes and n DNA molecules D. occurs in humans between spermatocyte I and spermatocyte II E. - may present anomalies responsible for viable triploidy
Item7 Time Remaining 1 hour 28 minutes 31 seconds01:28:31eBookReferencesItem 7 Time Remaining 1 hour 28 minutes 31 seconds01:28:31Identify the stages that occur during meiosis I.Check All That Applyprophaseprophaseanaphase Ianaphase Itelophase Itelophase Iinterkinesisinterkinesis
How many haploid cells are created at the end of meiosis?46CentromereTwoFour
Identify the stages of Meiosis where each event happens*8 pointsP-I M-i A-I T-I P-II M-II A-II T-IIChromosomes decondense, nuclear membrane may reform, cell divides (cytokinesis) to form two haploid daughter cells Spindle fibers contract and separate the sister chromatids, chromatids (now called chromosomes)move to opposite poles Chromosomes condense, nuclear membrane dissolves, homologous chromosomes form bivalents, crossing over occurs Spindle fibers from opposing centrosomes attach to chromosomes (at centromere) and align them along the cell equator. Spindle fibers contract and split the bivalent, homologous chromosomes move to opposite poles of the cell Spindle fibers from opposing centrosomes connect to bivalents (at centromeres) and align them along the middle of the cell Chromosomes condense, nuclear membrane dissolves, centrosomes move to opposite poles (perpendicular to before) Chromosomes decondense, nuclear membrane reforms, cells divide (cytokinesis) to form four haploid daughter cells Chromosomes decondense, nuclear membrane may reform, cell divides (cytokinesis) to form two haploid daughter cells Spindle fibers contract and separate the sister chromatids, chromatids (now called chromosomes)move to opposite poles Chromosomes condense, nuclear membrane dissolves, homologous chromosomes form bivalents, crossing over occurs Spindle fibers from opposing centrosomes attach to chromosomes (at centromere) and align them along the cell equator. Spindle fibers contract and split the bivalent, homologous chromosomes move to opposite poles of the cell Spindle fibers from opposing centrosomes connect to bivalents (at centromeres) and align them along the middle of the cell Chromosomes condense, nuclear membrane dissolves, centrosomes move to opposite poles (perpendicular to before) Chromosomes decondense, nuclear membrane reforms, cells divide (cytokinesis) to form four haploid daughter cells
It consists of two rounds of DNA replication and two rounds of cell division.Group of answer choicesmitosismeiosisneither mitosis nor meiosisboth mitosis and meiosis
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