If a gene is found only on the X chromosome and not the Y chromosome, it is
said to be a sex-linked trait. Because the
gene controlling the trait is located on the sex chromosome, sex linkage is
linked to the gender of the individual. Usually such genes are found on the
X chromosome. The Y chromosome is thus missing such genes (See Diagram above.).
The result is that females will have two copies of the sex-linked gene while
males will only have one copy of this gene. If the gene is recessive, then males
only need one such recessive gene to have a sex-linked trait rather than the
customary two recessive genes for traits that are not sex-linked. This is why
males exhibit some traits more frequently than females.
<span>Examples of Sex-linked Traits: </span>
Red-green colorblindness
Male Pattern Baldness
Hemophilia
<span>Duchenne Muscular Dystrophy</span>
<span>An incorrect number of
chromosomes is the most common form of genetic disorder that causes the fetus
to spontaneously abort. </span>The
human cells normally contain 23 pairs of chromosomes, for a total of 46
chromosomes in each cell. Error in one or more of the meiosis, mitosis,
maternal age, or environment are the possible cause of the chromosome
abnormalities. These abnormalities in the number chromosomes can cause problems
with development, growth and function of the body's systems. These changes can
occur in early fetal development, or in any cell after birth during the
formation of reproductive cells (sperm and eggs).
Answer:
The correct answer is - a, and b.
Explanation:
Plasticity is the ability of the change in the brain during course of life span. It is a remarkable ability to recovery after the surgery or removal of the part of the brain or injury to the brain.
The neurogenesis is the ability to the regeneration of the nervous system cell, it can occur in the adulthood as well however it takes approximately six week time.
Thus, the correct answer is - a, and b.
Answer:
Answer: b. developing more efficient methods of mining coal
Coal is a combustible black or brownish black sedimentary rock. Coal is produced by the dead plant matter. It is a fossil fuels that is used for generating electricity in the thermal power plants, used as cooking fuel, and fuel in automobiles. The burning of the coal results in the liberation of carbon dioxide, sulfur dioxide and carbon monoxide gases in the environment. These gases are responsible for causing the air pollution.
b. developing more efficient methods of mining coal is not a conservation tactic related to coal consumption because the more the efficient mining will promote the excavation of the coal which will further contribute to its extensive consumption and air pollution.
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Explanation:
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