What is Chiasmata quizlet?
chiasmata- point of contact between non-sister chromatids of homologous chromosomes where crossing over and exchange of genetic material occurs.
What are gametes ap bio?
Gamete. A haploid cell such as an egg or sperm. Gametes unite during sexual reproduction to produce a diploid zygote. Gametophyte. The multicellular haploid form in organisms undergoing alternation of generations that mitotically produces haploid gametes that unite and grow into the sporophyte generation.
Which is a homologous chromosome pair?
A homologous chromosome pertains to one of a pair of chromosomes with the same gene sequence, loci, chromosomal length, and centromere location. A homologous pair consists of one paternal and one maternal chromosome. In humans, there are a total of 46 chromosomes in the nucleus of a somatic cell.
What is the correct order of these meiotic events?
The correct order of mitotic events which occur during meiosis is: Formation of synaptonemal complex, recombination, separation of homologous chromosomes, separation of sister chromatids.
What occurs at the chiasma?
chiasmata) is the point of contact, the physical link, between two (non-sister) chromatids belonging to homologous chromosomes. At a given chiasma, an exchange of genetic material can occur between both chromatids, what is called a chromosomal crossover, but this is much more frequent during meiosis than mitosis.
What is diploid zygote?
Zygote is a diploid cell resulting from the fusion of two haploid gametes. Diploid (2n) means containing two complete sets of chromosomes, one from each parent. Haploid (n) on the other hand means having a single set of unpaired chromosomes, as in the gametes.
What is the meaning of zygote?
zygote, fertilized egg cell that results from the union of a female gamete (egg, or ovum) with a male gamete (sperm). In the embryonic development of humans and other animals, the zygote stage is brief and is followed by cleavage, when the single cell becomes subdivided into smaller cells.
How many chromosomes does a child inherit from his or her parents?
When a woman becomes pregnant, her egg joins with the father’s sperm to make a new cell. This cell will grow and divide into a baby. This first cell has 46 chromosomes, 23 from the mother and 23 from the father. All the instructions for how the child will grow are in the genes on these chromosomes.
What are sister chromatids quizlet?
Sister chromatids are duplicated copies of a single chromosome that are attached to each other and are identical. Meiosis. type of cell division that produces 4 cells, each w/ half the # of chromosomes as the parent cell; occurs in sex organs.
What is a chromosome vs chromatid?
Chromosomes carry DNA, which is the genetic material of that organism. Chromatids help the cells to duplicate and in turn, aid in cell division. A chromosome is present throughout the life cycle of the cell. A chromatid is formed only when the cell undergoes through either mitosis or meiosis stages.
What is mitotic and meiotic?
Learn more. There are two types of cell division: mitosis and meiosis. Most of the time when people refer to “cell division,” they mean mitosis, the process of making new body cells. Meiosis is the type of cell division that creates egg and sperm cells. Mitosis is a fundamental process for life.