A diploid rye plant Secale cereale has 2n 14 chromosomes an

A diploid rye plant, Secale cereale, has 2n = 14 chromosomes and approximately 1.6 times 10^10 bp of DNA. How much DNA is in a nucleus of a rye cell at (a) mitotic meta-phase, (b) meiotic metaphase I, (c) mitotic telophase, and (d) meiotic telophase II?

Solution

Question: A diploid rye plant Secale cereale, has 2n= 14 chromosomes and approximately 1.6 × 10^10 bp of DNA. How much DNA is in a nucleus of a rye cell at (a) mitotic metaphase, (b) meiotic metaphase I, (c) mitotic telophase, and (d) meiotic telophase II?

Answer:

(a) mitotic metaphase : 3.2 x 10¹⁰ bp.

(b) meiotic metaphase I : 3.2 x 10¹⁰ bp.

(c) mitotic telophase : 1.6 x 10¹⁰ bp.

(d) meiotic telophase II : 0.8 x 10¹⁰ bp.