Chromosomes

Chromosomes split during cell division (mitosis or meiosis) to ensure that each daughter cell receives a complete set of chromosomes. This process, called chromosome segregation, allows genetic information to be accurately replicated and transmitted to the next generation of cells.

The nucleus of a cell contains uncondensed chromosomes that have been duplicated. During the interphase of the cell cycle, before cell division, the chromosomes replicate and form sister chromatids that are still uncondensed and spread throughout the nucleus.

In meiosis, the production of unique gametes is a function of two things that happen during meiosis I in metaphase I: independent assortment of the chromosomes as they line up on the metaphase plate, and crossing over that occurs between chromosomes in the same tetrad. You can think of independent assortment as a type of random assortment if you like. Consider just the tetrads for the 1st and 7th chromosome. In the tetrads, there will be one chromosome that was inherited from the father and one chromosome from the mother (we can all them F and M). On the metaphase plate, chromosome 1 might have F on the left and M on the right, but that doesn't mean that the 7th chromosomes have to line up that way too: they line up independently of all the other tetrads, so have an equally likely chance of having F on left and M on right as having F on right and M and left. It is that randomness, which we refer to as independent assortment, that causes a great deal of variation in the gametes, because how the chromosomes are lined up during metaphase I sets the tone for where the chromosomes go in the remaining parts of meiosis, I and II. Crossing over, where a piece of F for chromosome 1 might swap places with a piece of M for chromosome 1, is another source of variation in the gametes. During anaphase II, there is not anything like either of these two events.

A Z chromosome is a sex chromosome in a species in which the female is heterogametic (i.e. has different sex chromosomes). The counterpart is the W chromosome.

In an XY system (e.g. humans), the male is heterogametic, XY, and the female is homogametic, XX.

In a ZW system, the male is homogametic, ZZ, and the female is heterogametic, ZW.

Examples of species with ZW systems include all birds, many reptiles, fishes and some insects.

When all the genes of a chromosome have duplicated but are still attached, the structures that are formed are called sister chromatids. Sister chromatids are identical copies of each other, and they are held together at a specialized region called the centromere.

In sexual reproduction, an organism inherits its chromosomes from both parents. Each parent contributes half of the total number of chromosomes required for the offspring. These chromosomes contain the genetic information necessary for the development and characteristics of the organism.

In the ZW sex chromosome system, the male genotype is ZZ. The letter Z represents the presence of a dominant male-determining gene, while the letter W represents the absence of this gene, which determines female development. Therefore, individuals with the ZZ genotype develop as males in this system.

The Y chromosome is smaller than the X chromosome and contains fewer genes. It carries the genes necessary for determining male sex and some other genes, but it lacks many of the genes present on the X chromosome. This is why the Y chromosome does not carry any alleles in the same way that the X chromosome does.

You can find images of chromosomes in scientific research articles, biology textbooks, or on reputable scientific websites such as the National Institutes of Health (NIH) or the Wellcome Trust Sanger Institute websites. Additionally, many educational resources and databases like the Human Genome Project or the Online Mendelian Inheritance in Man (OMIM) also provide images of chromosomes.

Chromosomes are inherited from our parents. During sexual reproduction, one set of chromosomes is contributed by the mother through the egg cell, and another set is contributed by the father through the sperm cell. When the sperm fertilizes the egg, the resulting zygote carries a unique combination of chromosomes from both parents.

There is no specific reason why a mutant chromosome would go to a tailor as chromosomes are found within cells and do not have agency or consciousness to make decisions. The concept of a mutant chromosome going to a tailor is purely fictional and not based on scientific understanding.

Chromosome pairs undergo a process called meiosis during which they are divided. One of the pairs, known as the sex chromosomes, determines the sex of an individual. In humans, females have two X chromosomes, while males have one X and one Y chromosome. These sex chromosomes are distributed randomly to sex cells during meiosis, resulting in the formation of eggs (in females) and sperm (in males) with varying combinations of sex chromosomes.

An elk has 68 chromosomes.

• a parrot has 24 chromosomes

yes particular one's do which are the xy chromasones

Down syndrome.

ZZ

Novanet Swag

autosomal
A+ Autosomal

A Lobster's body cells do have a nucleus and organelles, hence they are classified as Eukaryotes. Lobsters themselves are properly described on the macroscopic not microscopic scale, and as such the Lobster organism itself doesn't possess a single nucleus; again, the term organelles refers to structures with a cell. On a macroscopic scale the lobster is said to possess organs.

They have 19 Chromosomes

There are 46 chromosomes in your body cells. The egg cells have half the amount of chromosomes as the body cells, so there are 23 chromosomes in the egg cells.

There is a 50% chance of having a male or a female each time sex chromosomes and inherited. the 'X' chromosome is received from the mother. The 'Y' chromosome is received from the father.