192 After meiosis Il is complete, how many chromosomes are in each daughter cell

Question

192 After meiosis Il is complete, how many chromosomes are in each daughter cell? How does this compare to the number of chromosomes in your meiosis daughter cells? How does that number compare to the number of chromosomes in your par- ent cell that started meiosis? Are there homologous pairs of chromosomes in each of the four daughter cells? Are your daughter cells genetically identical?Explain your answer. Activity 8B Crossing Over During Meiosis Materials for group of 4) Pop bead chromosomes (from Activity 8A) Cell division poster Procedure During prophase I of meiosis, non-sister chromatids of a pair of homologous chrom somes may exchange pieces of genetic material from one homologue to the other. T event is called crossing over, and it results in recombination of genetic informat in the daughter cells (Figure 8.5). Restore the chromosomes to their original config tion, as shown in Figure 7.20. Repeat the meiosis simulation procedures, except thist simulate crossing over at prophase I. Do this by exchanging the exact segments of non-sister chromatids of a single homologous pair. maioci homelagous pairs of chromosomes com

Explanation / Answer

Answer: After meiosis II is complete how many chromosomes are in each daughter cell? 23 chromosomes. How does this compare to number of chromosomes in your meiosis I daughter cells? 23 chromosomes

(Since meiosis I is reduction division, at the end of meiosis I, the 46 chromosomes are halved to 23, i.e diploid sets of chromosomes, 23x2 (2n) get reduced to haploid sets 23(n). Meiosis II being equational division the chromosome number remains same as in the daughter cells of Meiosis I, i.e 23 which means haploid cells remain haploid in Meiosis II stage).

How does that number compare to the number of chromosomes in parent cell. The parent cell that undergoes meiosis has the diploid set of chromosomes, 2n=46, which exist in the form of 23 pair of chromatids.

Are there homologous chromosomes in each of the four daughter cells? NO

Are daughter cells genetically identical? NO, the daughter cells produced in meiosis are not genetically identical, since they result from seperation of homologous chromosomes and later sister chromatids.

How many chromosomes in zygote? Zygote is formed as a result of fusion of haploid egg and sperm, this makes zygote a diploid entity, and hence the total number of chromosomes in 2n zygote are 46.

Are there homologous pair of chromosomes in zygote? YES. How many pairs of homologous chromosomes are there in a zygote? There are 23pairs of homologous chromosomes in zygote.

Would the cell that has these chromosomes be diploid or haploid? Diploid. What is the diploid number for this cell? 2n= 46. What is the haploid number for this cell? n=23

If the zygote were to undergo mitosis the resulting daughter cells would be haploid or diploid? The resulting cells would be diploid

If the zygote were to undergo meiosis the resulting daughter cells would be diploid or haploid? The resulting daughter cells would be haploid.

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