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nondisjunction
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Which of the following would be most likely to decrease genetic variability. A bottleneck B B genetic drift C mutation D random mating?
A bottleneck event would decrease your population to a very small number and, consequently, your gene pool would contract, some alleles would be lost and genetic variability would decrease. Google Cheetahs.
Which would most likely decrease the genetic variation in the human population?
If the human population was reduced to a very small number of interbreeding individual then this small population, denied outbreeding, would have very little genetic variation. Humans, who went through a bottleneck event about 70,000 years ago, are considered a " small " species because they have little genetic variation in comparison to many other species. Google cheetah to see how this concept works.
What causes many endangered species that are now found only in zoos to have very little genetic variations?
Founder effect refers to the loss of genetic variation when a new colony is established by a very small number of individuals from a larger population. As a result of the loss of genetic variation, the new population may be distinctively different.Bottleneck effect is an evolutionary event in which a significant percentage of a population or species is killed or otherwise prevented from reproducing, and the population is reduced by 50% or more, often by several orders of magnitude.Population bottlenecks increase genetic drift, as the rate of drift is inversely proportional to the population size.They also increase inbreeding due to the reduced pool of possible mates.
Can the principles of probability be used to predict exact outcomes of genetic crosses?
Probability can be used to predict possible genotypes in offspring by using a Punnett Square. Source: The boringest and laziest science teacher: Mrs. Melissa Polimeni of Orchard Valley Middle School -AshaParekh44
Events supported by Visual Basic Objects?
move event,text change event and click event
Why did evolution not occur in down syndrome?
Down Syndrome is a the addition of an extra chromosome and not really related to evolution. It is more of a genetic mutation that causes this event to occur.
What can be used to explain the results of genetic crosses?
Probability. (probability is how likely an event is to occur.)
What is the important event during meiosis that results in genetic variation?
Crossing-Over
What causes disorders such as klinefelter syndrome and turner syndrome?
Klinefelter syndrome is a chromosomal condition that only affects males and is characterized by a male having an additional X chromosome (XXY) in cells. This chromosome abnormality occurs when there is an error in cell division, resulting in an extra copy of the X chromosome.
What are some diseases non-disjunction causes?
No " following, but a condition such as trisomy 21, Downs syndrome, is caused by nondisjuction. The chromosomes fail to separate properly and one child is left with an extra chromosome number 21. The potetial other children that could have been born of this nondijuction event, those with only one chromosome 21, are not viable.
What are the odds of a second pregnacey with turners disease?
Most cases of Turner syndrome are not inherited. When this condition results from monosomy X, the chromosomal abnormality occurs as a random event during the formation of reproductive cells (eggs and sperm). An error in cell division called nondisjunction can result in reproductive cells with an abnormal number of chromosomes. For example, an egg or sperm cell may lose a sex chromosome as a result of nondisjunction. If one of these atypical reproductive cells contributes to the genetic makeup of a child, the child will have a single X chromosome in each cell and will be missing the other sex chromosome.Mosaic Turner syndrome is also not inherited. It occurs as a random event during cell division in early fetal development. As a result, some of an affected person's cells have the usual two sex chromosomes (either two X chromosomes or one X chromosome and one Y chromosome), and other cells have only one copy of the X chromosome. Other sex chromosome abnormalities are also possible in females with X chromosome mosaicism.Turner syndrome (TS) is a medical disorder that affects about 1 in every 2,500 girls. Although researchers don't know exactly what causes Turner syndrome, they do know that it's the result of a problem with a girl's chromosomes.Most girls are born with two X chromosomes, but girls with Turner syndrome are born with only one X chromosome or they are missing part of one X chromosome. The effects of the condition vary widely among girls with Turner syndrome. It all depends on how many of the body's cells are affected by the changes to the X chromosome.Girls with Turner syndrome are usually short in height. Girls with Turner syndrome who aren't treated for short stature reach an average height of about 4 feet 7 inches (1.4 meters). The good news is that when Turner syndrome is diagnosed while a girl is still growing, she can be treated with growth hormones to help her grow taller.In addition to growth problems, Turner syndrome prevents the ovaries from developing properly, which affects a girl's sexual development and the ability to have children. Because the ovaries are responsible for making the hormones that control breast growth and menstruation, most girls with Turner syndrome will not go through all of the changes associated with puberty unless they get treatment for the condition. Nearly all girls with Turner syndrome will be infertile, or unable to become pregnant on their own.Other Effects Turner Syndrome Can HaveA number of other health problems occur more often in girls with Turner syndrome, including kidney problems, high blood pressure, heart problems, overweight, hearing difficulties, diabetes, and thyroid problems. Some girls with the condition may experience learning difficulties, particularly in math. Many have a difficult time with tasks that require skills such as map reading or visual organization.In addition to short stature and lack of sexual development, some of the other physical features commonly seen in girls with Turner syndrome are:a "webbed" neck (extra folds of skin extending from the tops of the shoulders to the sides of the neck)a low hairline at the back of the neckdrooping of the eyelidsdifferently shaped ears that are set lower on the sides of the head than usualabnormal bone development (especially the bones of the hands and elbows)a larger than usual number of moles on the skinedema or extra fluid in the hands and
Since it is possible to have identical twins of different genders could there be a nondisjunction in the sex chromosomes causing one twin to have Turners syndrome and the other to have Kleinfelters?
No, it is not possible for identical twins to have different sex chromosome conditions like Turner syndrome and Klinefelter syndrome. Identical twins develop from a single fertilized egg, so they have the same genetic material, including the sex chromosomes. If there was a nondisjunction event in one twin leading to an abnormal number of sex chromosomes, it would affect both twins, not just one.
Was the china syndrome based on a true event?
No, it was fictional.
What event prompted many states to strengthen their slave code?
Turner's Rebellion
What usual meiotic event leads to down syndrome In which parent?
Nondisjunction.
Why does turner's syndrome occur?
Going down to the cellular level, it occurs in meiosis when chromosomes fail to separate (nondisjuction). We get a set of chromosomes from our paternal side and the other set from out maternal side. For example, one of the gamete that may have came from our maternal side contains no chromosomes , O, when it should contain that chromosome x while from our paternal side we get a gamete containing the x chromosomes. This results in a XO, a sterile female when the normal sex chromosomes are XX or XY. -or- nondisjunction
What event in meiosis leads to genetic variation in organisms?
Genetic crossover occurs, which causes a sharing and transference of genetic information between maternal and paternal copies of chromosomes and further enhances the genetic variability of their offspring.
