SNA Sealencinn FviKi hnom BIOL321 8 Unit 3 Problem Set 29. Which of the followin

Question

SNA Sealencinn FviKi hnom BIOL321 8 Unit 3 Problem Set 29. Which of the following is not an accurate description of why odd numbered ploidys are uncommon? i. very unlikely for every chromosome in the set to segregate with the same number of chromosomes ii.gametes that are diploid for every chromosome are more likely to be fertilized by gametes that are haploid il. typically leads to aneuploidy iv.odd numbers of chromosomes do not have homolog pairs for every copy which results in the lone chromosome being randomly inherited 31. Why can organisms tolerate polyploidy but not most cases of aneuploidy?

Explanation / Answer

29. Ploidy means the number of sets of chromosomes in a cell. Humans have 2 sets of chromosomes, hence we are diploids.In diploids during meiosis the 2 copies move to the 2 poles and that helps in creating a diploid offspring.

Polyploids with odd numbers of chromosome sets cannot produce the perfect haploid or diploid after cell division which causes an intermediate stage called aneuploid. So they are usually infertile.

So the answer is iii. typically leads to aneuploidy

31. The changes in the number of Chromosomes are called polyploidy and aneuploidy. The changes in Chromosome number by one as a result of addition or deletion is called aneuploidy. The changes in Chromosome number in set from diploid to triploid or tetraploid is called polyploidy.

Hence aneuploidy is formed due to segregation defects and produes partial chromosome instead of a complete chromosome as in parent cell. So they are usually seen in genetic disorders in human (Tuner syndrome and Down syndrome

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

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