Title: HAP1 cells
Content:  Due to their haploidy, HAP1 cells are very useful in biomedical research and genetic experiments. When working in diploid cells, it is difficult to screen for mutations phenotypically, especially when considering recessive mutations. Because there are two copies of each gene, the mutation is often covered up by the non-mutated gene. In haploid cells, there is only one copy of each gene, so mutated phenotypes are immediately exposed. Before the development of haploid cells, much of this research was limited to microbes and other simple cells, but now the research can be applied to its target cell type: the human cell. Since their recent discovery, HAP1 cells cultured in vitro have been established as a dependable screening tool for targeted genetics screens.
Title: HAP1 cells
Content:  HAP1 cells are a cell line of human origin used for biomedical and genetic research. They are near haploid, having one copy of almost every chromosome and are smaller than the average human cell, growing to about 11 micrometers in diameter. HAP1 cells are derived from a line of cancerous cells, which means they are able to divide indefinitely.
Title: Ploidy
Content:   The term haploid is used with two distinct but related definitions. In the most generic sense, haploid refers to having the number of sets of chromosomes normally found in a gamete. Because two gametes necessarily combine during sexual reproduction to form a single zygote from which somatic cells are generated, healthy gametes always possess exactly half the number of sets of chromosomes found in the somatic cells, and therefore "haploid" in this sense refers to having exactly half the number of sets of chromosomes found in a somatic cell. By this definition, an organism whose gametic cells contain a single copy of each chromosome (one set of 
Title: Ploidy
Content:  or chromosome complement. The number of chromosomes found in a single complete set of chromosomes is called the monoploid number (x). The haploid number (n) refers to the total number of chromosomes found in a gamete (a sperm or egg cell produced by meiosis in preparation for sexual reproduction). Under normal conditions, the haploid number is exactly half the total number of chromosomes present in the organism's somatic cells, with one paternal and maternal copy in each chromosome pair. For diploid organisms, the monoploid number and haploid number are equal; in humans, both are equal to 23. When a human germ cell undergoes meiosis, the diploid 46 chromosome complement is split in half to form haploid 
Title: Haploidisation
Content:  Haploidisation is the process of halving the chromosomal content of a cell, creating a haploid cell. Within the normal reproductive cycle, haploidisation is one of the major functional consequences of meiosis, the other being a process of chromosomal crossover that mingles the genetic content of the parental chromosomes. Usually, haploidisation creates a monoploid cell from a diploid progenitor, or it can involve halving of a polyploid cell, for example to make a diploid potato plant from a tetraploid lineage of potato plants. If haploidisation is not followed by fertilisation, the result is a haploid lineage of cells. For example, experimental haploidisation may be used to recover a strain of haploid Dictyostelium from a diploid strain. It sometimes occurs naturally in plants when meiotically reduced cells (usually egg cells) develop by parthenogenesis. Haploidisation was one of the procedures used by Japanese researchers to produce Kaguya, a fatherless mouse; two haploids were then combined to make the diploid mouse. Haploidisation commitment is a checkpoint in meiosis which follows the successful completion of premeiotic DNA replication and recombination commitment.
Title: Ploidy
Content:  still be called haploid even though they are numerically diploid. An alternative usage defines "haploid" as having a single copy of each chromosome – that is, one and only one set of chromosomes. In this case, the nucleus of a eukaryotic cell is only said to be haploid if it has a single set of chromosomes, each one not being part of a pair. By extension a cell may be called haploid if its nucleus has one set of chromosomes, and an organism may be called haploid if its body cells (somatic cells) have one set of chromosomes per cell. By this definition haploid therefore would not 
Title: Meiosis
Content:  haploid state and the other during the diploid state). In this sense there are three types of life cycles that utilize sexual reproduction, differentiated by the location of the organism phase(s). In the diplontic life cycle (with pre-gametic meiosis), of which humans are a part, the organism is diploid, grown from a diploid cell called the zygote. The organism's diploid germ-line stem cells undergo meiosis to create haploid gametes (the spermatozoa for males and ova for females), which fertilize to form the zygote. The diploid zygote undergoes repeated cellular division by mitosis to grow into the organism. In the haplontic life cycle (with post-zygotic meiosis), the organism is haploid instead, spawned by the proliferation and differentiation of a single haploid cell called the gamete. Two organisms of opposing sex 
Title: Cell growth
Content:  had. This is the haploid amount of DNA, often symbolized as N. Meiosis is used by diploid organisms to produce haploid gametes. In a diploid organism such as the human organism, most cells of the body have the diploid amount of DNA, 2N. Using this notation for counting chromosomes we say that human somatic cells have 46 chromosomes (2N = 46) while human sperm and eggs have 23 chromosomes (N = 23). Humans have 23 distinct types of chromosomes, the 22 autosomes and the special category of sex chromosomes. There are two distinct sex chromosomes, the X chromosome and the Y chromosome. A diploid 
Title: HAP1 cells
Content:  HAP1 cells are malignant neoplastic cells, also known as cancer cells. These cells are characterized primarily by uninhibited growth. As the rate of mitosis increases, defects in the nuclear spindles form, which results in atypical chromosomes, such as those found in HAP1 cells. Due to their irregular chromosomes, malignant cells are also morphologically different from healthy cells. These cells are often irregular shapes and sizes. They have large nuclei, prominent nucleoli, and scarce or atypically colored cytoplasm. Ribosomes and mRNA accumulate in the cytoplasm and membrane bound organelles change in shape, size, and function. Some become larger than normal, greatly reduced, or entirely non-existent. HAP1 cells are derived from leukemic cells, which develop from mutated myeloid cells in the bone marrow. Healthy myeloid cells produce red blood cells, platelets and white blood cells (apart from lymphocytes). For CML to develop, an abnormal gene called BCR-ABL is formed, which turns the myeloid cell into a CML cell.
Title: HAP1 cells
Content:  HAP1 cells have been used to create a new completely haploid cell line. Researchers used CRISPR/Cas9 system to delete the portion of Chromosome 15 that is present in HAP1 cells. They simultaneously cleaved both ends of the Chromosome 15 region by the endonuclease Cas9, which led to the elimination of the fragment. The Cas9 was programmed by short guide RNAs (gRNAs) to cleave any sequence complementary them. The sequence for the Chromosome 19/15 fusion is unknown, so the gRNAs were programmed to cut within the Chromosome 15 region. With this technique, experimenters were able to cultivate the first fully haploid human cell line which they termed eHAP.

Question: where are haploid cells found in the human body?
Answer: sperm.
sperm or egg cells.
ova.