0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
If nondisjunction occurs in meiosis II for one chromosome what will be the result at the completion of meiosis?
Some gametes may have an extra copy of some genes.
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.
What phase occurs when one extra chromosome is produces?
Down Syndrom
How could a zygote be produced with an XYY karyotype?
An XYY zygote can be formed if a pair of sex chromosomes fails to separate during meiosis, so the gamete formed has both the X and Y chromosomes. This gamete would then meet the other gamete from the other cell that would contain a Y sex chromosome. The resulting zygote that is formed would have XYY sex chromosomes. This abnormalty where there is an extra chromosome or is missing a chromosome is called nondisjunction.
What does it mean when someone has an extra chromosome?
If someone has an extra chromosome it means there was a genetic mutation that is abnormal in human development. It may result in problems with the person affecting them on a basic level, or may go fully unnoticed. A common disorder that can be caused by having an extra chromosome is Down's Syndrome.
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
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 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 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.
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 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)
If nondisjunction occurs in meiosis II for one chromosome what will be the result at the completion of meiosis?
Some gametes may have an extra copy of some genes.
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.
What phase occurs when one extra chromosome is produces?
Down Syndrom
What is the main reason Down Syndrome occurs?
Babies are born with an extra chromosome.
How does someone with Down syndrome get that extra chromosome?
During meiosis homologous chromosomes are separated and only one copy of each chromosome goes into the gamete. If they aren't separated correctly, both copies may go into the gamete. After fertilisation, the embryo will contain 3 copies of that chromosome. If this occurs with chromosome 21, it will result in Down Syndrome.
Down syndrome is usually caused by an extra copy of what chromosome?
Down syndrome occurs because of the extra chromosome on chromosome 21. If you go onto google images and type in karyotype of Down syndrome, you will find a picture of the extra chromosome. Instead of having two chromosomes on chromosome 21, there is an extra. Type your answer here...
