I know some of them.
For instance, blood cells, nerve cells, sperm cells, and egg cells.
Answer:
all cells have the same genes, but different genes are active in different cells
Answer:
Explanation:
Selection is the greatest force that alters gene frequency and brings about variation that is evidence in a population. There are both natural and artificial selection.
Mutation is one of the force that alters population frequency it is an heritable change that is sudden and occur in the gene, it can be induced or caused naturally.
The insect survived the DDT used because over the years they have build immunity and resistance against the chemical, they now mutate and produce gene that becomes resistance to the chemical and now adapted or adaptable to the environment. Natural selection helps in the continuous perpetuation of the new phenotype and a new differential survival rate.
Answer:
- Crystallization (cooling or solidification)
- Erosion and sedimentation (lithification, burial and deposition)
- Metamorphism (Melting due to heat and pressure)
Explanation:
In rock cycle, there are three important processes that changes one type of rocks into another type. Those processes are:
- <u>Crystallization:</u> It is a process that takes place under the earth surface where magma cools down and is hardened to form igneous rocks. This process is also called freezing of rocks.
- <u>Erosion and sedimentation:</u> The rocks on the surface of earth are broken into smaller fragments called sediments that are formed by weathering of rocks. These sediments are then carried either by wind or water to different places and settles at some place to form another type of rock named sedimentary rocks.
- <u>Metamorphism:</u> Metamorphism takes place under the earth surface where extreme heat changes the mineral texture of the rock but does not melt it. such rocks are named as metamorphic rocks.
Answer:
Mendel's law of segregation states that every living organisms comprises of two alleles for each trait. During the process of meiosis of cell division each allele segregate to form two gametes each containing a single allele.
Explanation:
Mendel conduct experiment of different traits of pea plants. He considered the first generation as F1 and second generation as F2. Each and every of all the traits of pea plants show same pattern of inheritance. In the F1 generation one of the two traits under consideration disappears, this forms the recessive traits. While in the next generation, that is , F2 generation the recessive trait again reappeared. The ratio of dominant and recessive traits being 3 and 1 respectively.
In human being, sex chromosomes determine the gender of the offspring. Hence Paternal chromosome would be XY and maternal would be XX. According to punnett square method, the genotypes of offspring would be:
Hence 2 male (XY) and 2 female (XX) offspring conclude that there is 50-50 chances of a couple producing male or female offspring.