Answer:
A white mouse is purely recessive, and will produce black offspring if the other mouse contributes a black gene.
Explanation:
If Bb then the offspring will be 50% Bb and 50% bb. This is called a test cross, where we use a recessive to determine the genotype of a dominant phenotype.
Answer:
The correct answer is 2.) 1 , 2
Mitosis is a type of cell division in which single parent cell divides into two daughter cells with equal number of chromosomes as in the parent cell.
It occurs in somatic cells of the body for growth and repair of the tissue.
It maintains the chromosomal number between parent and daughter cells and it is the reason that it is also called as equational division.
Answer:
E. Malaria
Explanation:
Schizogony refers to the process of asexual reproduction through the process of multiple fission. The malaria parasite, <em>Plasmodium</em> species, enters the human body through the bite of female anopheles mosquitoes.
These mosquitoes carry haploid sporozoites in their saliva which are released into the bloodstream of human. The haploid sporozoites enter the liver cells where they multiply and increase their number through the process of multiple fission.
The process of schizogony in sporozoites of malaria parasite produces merozoites which are then released from the liver cells.
1. The lining up of chromosomes by the spindle fibers takes place at metaphase II phase. It is the second stage of meiosis II, the spindle draws the chromosomes towards the metaphase plate.
2. The formation of the nuclear envelope around each set of DNA takes place in telophase II. Along with the formation of the nuclear envelope, the process of cytokinesis also takes place in telophase II, producing four daughter cells, each comprising a haploid set of chromosomes.
3. The sister chromatids are pulled apart in anaphase II stage. In this phase, the sister chromatids are migrated towards the opposite poles of the cell with the help of protein fibers.
4. The centromeres are moved towards the poles of the cell at prophase II stage.
Identifying the genetic sex of a child is based on finding intracellular Barr bodies that consist of inactive chromatin material.
Inactive chromatin material is the one where no transcription takes place. It is also known by the name heterochromatin. It appears as a dark condensed form in the chromatin.
Barr bodies are the inactive X chromosomes. These are mad inactive by a process termed as lyonization. It is essential to make the chromosome inactive in organisms with XY type of sex determination. They are present at the periphery of the nucleus. Inactivation of X chromosome makes the amount of X chromosomes equal in both, males and females.
To know more about Barr bodies, here
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