a. i. Write down the genotype and phenotype of the mother. The genotype of the mother = bb The phenotype of the father = white coloured skin ii. What is the phenotypic and genotypic ratio of black and white complexion in F2 generation? Phenotypic .....

Coal is formed when the remains of trees, fern and other plants are buried under the soil by a natural disaster such as earthquakes and volcanic eruptions. As more soil deposited on them, they are compressed. When the temperature rises they sink .....

Mendel's law of dominance states that when a cross is made between a pair of pure contrasting characters, only one of them is able to express itself phenotypically while the other remains hidden in F1 generation. The character which is expressed .....

a. F2 generation is shown in the given diagram. b. It supports the law of purity of gametes. c. Phenotypic ratio = 3:1    Genotypic ratio = 1:2:1 d. This shows the cross between pure red (RR) and pure white (rr). That is .....

In this particular cross, black colour is dominated and the brown is the recessive character. According to Mendel's first law that is the law of dominance only one character is expressed in the offspring while the other remains in expressed or .....

Haemophilia is the sex-linked (X-linked) diseases that are seen only in the male. BB = Pure black. Bb = Hybrid black bb = pure white Genotypic ratio = 1:2:1 Phenotypic = .....

The genotype for long-winged drosophila is LL. The genotype for short-winged drosophila is ll. Genotypic ratio = 1:2:1 Phenotypic ratio = .....

Here, TT represents tallness and it represents dwarfness. TT = Pure tall Tt = Hybrid tall tt = Pure dwarf Phenotypic ratio = 3:1 Genotypic ratio = .....

Yes, Mendel's law can also be applied in human beings. The difficulties that he would have faced, if he had carried it on human are: i. Human beings produce only one offspring at a time. So, it would be difficult to compare the characteristics .....

The two applications of Mendel's law of inheritance are: i. It gives a new idea about the new combination of hybrids.  ii. New types of plant with new combinations can be .....

The genotype for black hybrid mouse is Bb. The genotype for pure white mouse is bb.  The cross between them is shown as:

.....

Law of segregation states that the two members of a pair of factors separate during the formation of .....

The organisms containing both dominant and recessive characters of an allelic pair are called .....

When two unit characters are involved in a cross, it is called dihybrid .....

The transmission of characters from the parents to offsprings is termed as .....

Water is the most important for element for the survival of the life of the living creatures. It is the key component for the reproductive cycle of all the living organism and plants. It is a home for many plant and animals. It helps in cleaning. It .....

Water in its purest form is colourless and odourless. But due to various human as well as natural activities, many pollutants enter the sources of water and make them polluted. This causes the water to be unsafe for daily usage. Water pollution can .....

The effects of environmental pollutions are: a.    People are facing various diseases like asthma, typhoid, cancer, diarrhoea, etc. b.    The world is facing the rise in the temperature due to which the sea level is .....

A joint five-year survey conducted by the Department of Forest Research and Survey and the National Forest Products Survey Project in between 2067 to 2071 BS, shows that of the total 147,181 square kilometres area of Nepal, forest area makes up .....

The reasons for launching artificial satellites in space are: a.    To collect more and reliable information about solar system, stars, nebulas and galaxies. b.    To research the life in outer space. c.   .....

It is because a frog reproduces by crossing only. Thus, purity of characters cannot be checked in them. Similarly, they lack a large number of contrasting pairs of characteristics that can be observed from .....

The measures of conservation and management of forests are: i.    Systematic and scientific ways must be used to cut down and plant trees. ii.   The laws made by the government for the preservation of forest must be .....

The control measures of soil pollution are: i.    The use of harmful chemical fertilizers must be replaced by compost manure in order to maximize the crop yield. ii.    Proper disposal of domestic wastes must be .....

The effects on human health due to air pollution are: i.    The minute solid particles like carbon enter into our body and become the major cause of lung disease. ii.    Carbon monoxide gas is poisonous. It mixes with .....

The ways for soil management are: i.    Pesticides and insecticides should be used in a limited amount in the agricultural field. ii.    There should be the gap between the harvesting of crops and spray of .....