Question

what is the ploidy number of gametes produced by a tetraploid if nondisjunction involving all chromosomes occurs in meiosis 1​

Answer 1

Answer:

n - 1 designates a cell missing a chromosome for a total of only 22 chromosomes in humans. Nondisjunction in meiosis I occurs during anaphase I when one pair of homologous chromosomes fails to separate. In this example, one cell with 5 chromosomes and one cell with 3 chromosomes are produced

Answer 2

• During meiosis ,Ploidy in terms of chromosome number (c) is    altogether different. In this case we are simply concerned with the tota number of chromosomes (amount of DNA) and not at all concerned  about gene loci or whether the chromosomes are maternal or  paternal.
• A human cell that is diploid in terms of chromosome number (2c) also    contains 46 chromosomes that makeup 23 pairs. The "2" signifies the fact that each pair of chromosomes is represented by two chromosomes.
• The "c" is the total number of pairs of chromosomes in the cell. When this  cell replicates its DNA in preparation for division it makes copies of every chromosome.  
• Each of the replicated chromosomes consists of two chomatids that are connected at the centromere and, as above, each of these chromatids represents a complete chromosome.  
• Thus, we have now doubled the number of chromosomes in the cell and ploidy in terms of chromosome number is 4c.
• The "4" signifies the fact that each pair of chromosomes is now represented by 4 chromosomes (i.e., 2 copies of each member of the original pair or chromosomes).  
• The "c" is the total number of pairs of chromosomes in the cell.