0
This extra chromosome in a gamete occurs as a result of a process called nondisjunction, where chromosomes fail to separate properly during meiosis. As a result, one gamete may end up with an extra chromosome, leading to conditions such as Down syndrome when that gamete contributes to fertilization. Nondisjunction can happen during either the first or second meiotic division and can affect any of the chromosomes.
What else can I help you with?
If nondisjunction occurs in meiosis II for one chromosome what will be the result at the completion of meiosis?
If nondisjunction occurs in meiosis II for one chromosome, the result would be that one gamete receives an extra copy of the chromosome and one gamete lacks that chromosome. This results in aneuploidy in the offspring, which can lead to genetic disorders such as Down syndrome.
How could a zygote could end up with a extra chromosome?
how could a zygote end up with an extra chromosome Either the egg or the sperm doesn't divide equally.
How many chromosomes will a zygote with trisomy have?
Meiotic nondisjunction. In meiosis I or II, chromosome pair 21 fail to separate correctly, leaving one gamete with an extra chromosome 21.
How does trisomy occur?
Trisomy occurs when an individual has three copies of a particular chromosome instead of the usual two. This can happen during the formation of sperm or egg cells, leading to an extra copy of the chromosome in the resulting embryo. Trisomy can result in conditions like Down syndrome, where there is an extra copy of chromosome 21.
What phase occurs when one extra chromosome is produces?
Down Syndrom
Down syndrome is a genetic disorder caused by the presence of an extra chromosome in the body cells of humans this extra chromosome occurs in the gamete as a result of?
an error in meiotic cell division
If nondisjunction occurs in meiosis II for one chromosome what will be the result at the completion of meiosis?
If nondisjunction occurs in meiosis II for one chromosome, the result would be that one gamete receives an extra copy of the chromosome and one gamete lacks that chromosome. This results in aneuploidy in the offspring, which can lead to genetic disorders such as Down syndrome.
What effect does nondisjunction have on the chromosome number of the gametes?
It gives one of the gametes an extra chromosome and leaves the other gamete with one less chromosome.
What are tetrasomics?
Addition of a pair of chromosomes to a diploid set results in tetrasomic condition. Tetrasomics may be represented as 2N+2. Tetrasomics may arise when two abonormal gametes produced as a result of non-disjuction unite, with each gamete carrying an extra chromosome of the same pair as shown below. AABBCCDD a diploid cell----meiosis and non disjuction AABC Gamete carrying an extra chromosome--- BC Gamete short of one chromosome. Now if this Gamete (AABC) unites with another gamete of the same kind (AABC), we get tetrasomic AAAABBCC.
What is the cause of Down Syndrome during meiosis?
Down's Syndrome is caused due to the presence of an extra 21st chromosome, resulting in 3 sets of 21st chromosome instead of just 2. This is because during Anaphase II of Meiosis II non-disjunction occurs and instead of one 21st chromosome going into each gamete, both go into one of the gametes and none goes into the other. When a normal gamete fuses with the gamete with an extra21st chromosome, it forms a zygote with 3 sets of 21st chromosome instead of 2 and that is known as Down's Syndrome.
If a human gamete with an extra chromosome participated in fertilization with a normal human gamete what condition results?
A trisomy. Trisomies are usually fatal in all chromosome pairs except 5, 13, 21 (these cause Down syndrome), and 23 (The chromosome pair that determines gender)
Name 2 chromosomal diseases that are not inherited?
two chromosomall diseases that aren't inherited are Downs Syndrome, which is an extra chromosome on the number 21, it occurs in 1 in 650 births, often in women over 35, and Klinefelter's Syndrome, which is the presence of an extra x cromosome, ie XXY, it is a result of nondisjunction during gamete formation.
If a human gamete with an extra chromosome participates in fertilization with a normal gamete what conditions result?
It depends on what's missing. Zygotes missing a chromosome (monosomy) have 45 chromosomes and many do survive; some human monosomies are monosomy 7, 11 or 13. A monosomy X results in Turner syndrome; there must be at least one X chromosome, or the embryo won't survive.
How many chromosomes will a zygote with trisomy have?
Meiotic nondisjunction. In meiosis I or II, chromosome pair 21 fail to separate correctly, leaving one gamete with an extra chromosome 21.
How could a zygote could end up with a extra chromosome?
how could a zygote end up with an extra chromosome Either the egg or the sperm doesn't divide equally.
How does trisomy occur?
Trisomy occurs when an individual has three copies of a particular chromosome instead of the usual two. This can happen during the formation of sperm or egg cells, leading to an extra copy of the chromosome in the resulting embryo. Trisomy can result in conditions like Down syndrome, where there is an extra copy of chromosome 21.
What phase occurs when one extra chromosome is produces?
Down Syndrom
