By the end of prophase, each of the following has occurred except
question 7 options:

tighter coiling of the chromosomes

breaking down of the nuclear envelope

disappearing of the nucleolus

lining up of chromosomes in the cell

The correct answer is lining up of chromosomes in the cell.

Explanation:

The first subphase of mitosis is called prophase in which chromosome become condensed and the breakdown of the nuclear membrane occur along with disappearance of nucleolus.

    But the lining up of chromosome occur during metaphase in which chromosomes are specifically arranged in a equatorial region or metaphase plate.

after making a punnet square using bv bv bv bv you will find that the ratio will be 9: 7 or a 128.6% probability.

hope this