Answer:
The frequency of homozygous recessive offspring in a cross between two heterozygotes is 25%.
Explanation:
Since the alleles are of two types, that is dominant and recessive alleles. An heterozygous parent will have both alleles.
So, we can represent our dominant allele with G and the recessive allele with g.
Then, the two heterozygous parents will have Gg genes.
These alleles will be segregated into their singleness. the first parent will therefore have G and g and the second parent will also have G and g
Crossing these alleles using punnet's square, we the have the following genotypic ratio of the progenies: 1GG: 2Gg: 1gg
Therefore, the 1gg is the only heterozygous offspring out of the expected four offsprings. This made the frequency to be 1/4 X 100 = 25%.
Answer:
Second-intention healing
Explanation:
There are two types of wound healing. Primary-intention and secondary intention healing. They both occur in four stages namely;Homeostasis,inflammation, proliferation and remodelling
In primary-intention healing, it occurs in wounds with dermal edges that are close together example wounds made by a scapel.
Healing by secondary intention occurs when the sides of the wound are not opposed that is, they are not surgically approximated, therefore healing must occur from the bottom of the wound upwards. That is by granulation, contraction, and epithelialization
Answer:
The correct answer is D. Desertification can happen as a result of non-sustainable agriculture.
Explanation:
Desertification is a process of ecological degradation in which the fertile and productive soil loses all or part of the production potential. This happens as a result of deforestation and destruction of the vegetation cover, the subsequent erosion of the soils, the overexploitation of aquifers, the over-irrigation and consequent salinization of the lands or the lack of water; human beings frequently favor and increase this process as a result of activities such as excessive cultivation and grazing or deforestation. According to data from the United Nations Environment Program (UNEP), 35% of the surface area of continents can be considered as desert areas, within these territories millions of people survive in conditions of persistent drought and food shortages. Among many other factors, it is considered that the expansion of these deserts is due to human actions.
Answer:
The answer is dopamine, tegmental
Explanation:
The most effective sites for self- stimulation for reward are along the trajectory of the Dopamine axons airising in the ventral Tegmental area and projecting to the forbiden.
Answer:
Cell is the structural and functional unit of life.
Explanation:
The organisms are classified on the different characteristics basis on the similarities and differences among the organisms. On the cellular basis two main types of organism are unicellular organism and multi cellular organism.
The cell theory of the life was given by Schleiden and Schwann. The cell acts as the basic unit of life as all living organisms are made of the cell. The cell combine together to form tissue, tissue to form organs and organ system as given in the example of the cat.