Questions: 1. In starfish, the diploid chromosome number is 36 (2n-36). How many

Question

Questions: 1. In starfish, the diploid chromosome number is 36 (2n-36). How many chromosomes would you expect to find in an unfertilized starfish egg? 2. The fertilization envelope forms around the newly-fertilized egg to prevent a condition called polyspermy. How many chromosomes would you predict you'd find in an egg that had a defect in its fertilization membrane and was fertilized by 2 sperm? Why? 3. If the type of cell division is mitosis, do the nuclei of the developing embryo contain the same or different genetic information than the zygote's nucleus?

Explanation / Answer

1. unfertilised egg will be haploid so unfertilised egg will be expected to have 18 chromosomes.

2.fertilised chromosome will have two copies of chromosomes one from the egg and other from the sperm.if the condition of polyspermy occurs then the resulting zygote will have 3 copies of chromosomes, one from egg, two from sperms.

3.mitosis does not cause recombination so the genetic information will be same as zygotes nuclei.zygote divides by mitosis to form eight cell stage called stem cells.

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.