Cell Cycle and Chromosomes

All are useful tokens for genetic or physical mapping of human chromosomes.

47, XX,+16 is a chromosomal abnormality in which there are three copies of chromosome 16 rather than two. It is the most common chromosomal cause of miscarriage during the first trimester of pregnancy. It is impossible for an infant to take birth with an extra copy of this chromosome present in all cells.

Ovum has one One X chromosomes.  Ovum of human does not have Z- Chromosome.

Spermatids are the product of the final meiotic division. They undergo an elaborate process of maturation,  i.e. spermiogenesis to become spermatozoa.

It is false because some cells like red blood cells or nerve cells cannot repair themselves or multiply themselves but most cells like skin cells can.

In a dividing cell, the chromatin material forms small thread like structures called chromosomes.

Yes, it is correct. It is present in the female's uterus and helps in baby's protection and growth. To check the abnormality in chromosomes, amniotic fluid is used.

Yes, it is correct. The chromosomal pattern of the amniotic fluid determines the sex of a foetus.

Homologous chromosomes are matching pairs that are similar in size, shape, and gene loci. One comes from the mother and one from the father. They are present in all diploid cells, not just sex cells.

Chromosomes are composed of DNA tightly coiled around proteins called histones. This DNA-protein complex is called chromatin. The proteins help organize and regulate the DNA.

In humans, sex determination depends on which type of sperm fertilizes the egg. Sperm carry either X or Y chromosomes, while eggs always carry X. An X sperm produces XX (female), while a Y sperm produces XY (male).

 In humans, each cell normally contains 23 pairs of chromosomes, i.e. a total of 46. 22 of these pairs (44 in number), called autosomes, look the same in both males and females. The 23^rd pair, the sex chromosomes, differ between males and females. Females have two copies of the X chromosome, while males have one X chromosome and one Y chromosome.

Humans have 46 chromosomes total, which are organized as 23 pairs. One chromosome in each pair comes from the mother and the other from the father. This includes 22 pairs of autosomes and one pair of sex chromosomes (XX for females, XY for males).

Human females have two X chromosomes (XX) in their cells, while males have one X and one Y chromosome (XY). The presence of at least one X chromosome is essential for female development. The SRY gene on the Y chromosome triggers male development in its absence.

The typical cell cycle duration of 24 hours is for mammalian cells in culture. However, this varies widely - from 20 minutes in yeast embryos to several months in some adult cells. The question doesn't specify the cell type, making 24 hours a reasonable default for typical somatic cells.