Does metaphase replicate DNA?
Metaphase is the third phase of mitosis, the process that separates duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells.
What chromosomes do insects have?
Common sex determination systems in insects. With male heterogamety, males have heteromorphic sex chromosomes (XY), and females are homomorphic (XX). With female heterogamety, females have heteromorphic sex chromosomes (ZW), and males are homomorphic (ZZ).
Does meiosis occur in insects?
Meiotic drive has been studied in insects and has been proposed to be a future tool for suppressing pest populations. Meiotic drive alters the equal assortment of chromosomes during meiosis so that certain chromosomes are inherited by the progeny more frequently than expected (greater than 50% of the time).
What happens in metaphase with chromosomes?
Metaphase During metaphase, the nucleus dissolves and the cell’s chromosomes condense and move together, aligning in the center of the dividing cell. At this stage, the chromosomes are distinguishable when viewed through a microscope.
What phase do chromosomes replicate?
In the eukaryotic cell cycle, chromosome duplication occurs during “S phase” (the phase of DNA synthesis) and chromosome segregation occurs during “M phase” (the mitosis phase).
During which phase of cell cycle does DNA duplication or replication take place?
The S phase of a cell cycle occurs during interphase, before mitosis or meiosis, and is responsible for the synthesis or replication of DNA. In this way, the genetic material of a cell is doubled before it enters mitosis or meiosis, allowing there to be enough DNA to be split into daughter cells.
Do insects have XY chromosomes?
The XX/XY system is found in most other mammals, as well as some insects. In this system, most females have two of the same kind of sex chromosome (XX), while most males have two distinct sex chromosomes (XY).
Do you think the number of chromosomes in the male and female are equal in insects?
Insects such as bugs, grasshoppers, and cockroaches females have two X chromosomes and males have one X chromosome. This is called male heterogamety. These organisms contain 23 chromosomes in males and 24 chromosomes in females.
What are the mode of reproduction of insects?
Most insects reproduce oviparously, i.e. by laying eggs. The eggs are produced by the female in a pair of ovaries. Sperm, produced by the male in one testis or more commonly two, is transmitted to the female during mating by means of external genitalia. The sperm is stored within the female in one or more spermathecae.
What are the two types of reproduction in insects?
Most insects reproduce by sexual reproduction. The female produces eggs, which are fertilized by the male, and then the eggs are usually placed near the required food. In some insects, there is asexual reproduction during which the offspring come from a single parent.
During which phase is the DNA duplicated?
Which of the following events occurs during metaphase?
Which of the following events occurs during metaphase of mitosis? The chromosomes align along the metaphase plate of the cell.