18) What chromosomes belong to a normal human male? A) 23 pairs of chromosomes which includes two Y chromosomes B) 46 chromosomes which includes two Y chromosomes C) 46 chromosomes which includes one X chromosome, and one Y chromosome D) 23 chromosomes which includes one Y chromosome 19) Which of the following occurs in prophase I that does not occur in prophase II? A) Chromosomes move to the middle of the cell. B) Spindle formation occurs. C) Chromosomes are duplicated. D) Crossing over occurs. 20) During metaphase I, A) crossing over occurs B) homologous chromosomes line up in the middle of the cell C) the nuclear envelope breaks up D) sister chromatids separate and migrate to opposite poles
Answer
Questions 18
Answer c is correct
23 pairs or 46 chromosomes which includes one X and one Y
chromosomes
Incorrect options
Option a
23 pairs of chromosome are correct but male human contain only
one X and one Y chromosomes
Option. b
46 chromosomes are correct but contane only one X one Y
chromosome
Option d
Male human contain not a 23chromosomes , 23pairs of chromosome s
and which includes one X chromosome and Y chromosome
