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What happens if an organism has too many or too few chromosomes?
If an organism has too many chromosomes (polyploidy), it can disrupt normal development and lead to genetic disorders or even be fatal. If an organism has too few chromosomes (aneuploidy), it can also cause developmental abnormalities, reproductive issues, and health problems. Both situations can lead to infertility or decreased viability of the organism.
Which human cells never have 23 pairs of chromosomes?
Human sex cells which only have a haploid number of chromosomes. 23 total chromosomes. Red blood cells have no chromosomes also.
What happens during meiosis that ultimately results in a defect characterized by the deletion of chromosomes?
Nondisjunction occurs in too many cells or too few cells causing defects
How many chromosomes are there in each cell?
Humans typically have 46 chromosomes in each cell: 23 from the mother and 23 from the father. This genetic material carries the instructions that determine our physical characteristics and other traits. Some organisms may have a different number of chromosomes in their cells.
What is it called when homologous chromosomes fail to separate properly causing to the gametes to have too many or too few chromosomes?
Complicated.
Why is it important for egg cells to only have 18 chromosomes?
Only in that way do you get a human zygote - each chromosome MUST be paired and there must be 46 total to get a true human. (Note that in reality there are occasional mismatches - either too many or too few - and the result is always a defective child.)
Failuare of homologous chromosomes to separate properly during meiosis result in gametes with too many or too few chromosomes?
nondisjunction
How many chromosomes do hamsters have?
13,679 in most cases. However in some rare hamster species there are 13,680 chromosomes, these of which live in rural areas situated with little human contact and few predators. Living in the wild of many island in the Pacific Ocean.
If a parent cell has six chromosomes how many chromosomes will be in each daughter cell?
Mitosis is the normal process of Cell division, so each daughter cell is (hopefully) a clone of the original. With a few exceptions such as sex and red blood cells, all human cells in a normal human being have 2 sets of 23 chromosomes. Therefore, the answer to this question is 46 chromosomes.
What might be the effect of inheriting more than the normal number of chromosomes in a human?
The implications of too many or too few chromosomes from the normal chromosomes are birth defects. With too many chromosomes a child could have Down Syndrome. With too few chromosomes a child could have Turner Syndrome.
Whether a human is male or female is determined by his or her?
Their genotype. The human has 46 chromosomes, or two pairs of 23 chromosomes (haploid) where one pair of these chromosomes contain the genetic information that determines a human's gender. The female possesses a pair of chromosomes labelled as XX. The male possesses a pair of chromosomes labelled as XY. In the case of a male, the Y gene is inherited from the father (X from the mother) and does not contain the usual genotypes that determine an individual's appearance etc. Instead it contains a few genes that activate body functions in the male such as producing hormones in the testes, or enabling the male to possess a deeper voice etc.
What happens when a fetus has 3 cromizones instead of 2?
a "normal" human being should have a total of 46 chromosomes. 23 from mom, 23 from dad. if something goes wrong during meiosis, the chromosomes may not be separated normally and a gamete (sex cell, known as sperm or egg) will have either too few or too many chromosomes. this is known as aneuploidy. the effects of aneuploidy on the zygote will vary depending on what chromosomes you are talking about. in the case of chromosome #21, having one extra is called "trisomy 21" which leads to the condition known as down syndrome. chromosome pairs 1-22 are a person's autosomes. the 23rd pair are sex chromosomes. aneuploidy affecting the sex chromosomes can have various effects, depending on what chromosomes are inherited. as you can see, the effects of aneuploidy depend on the specific chromosome number/pair. aneuploidy usually is not fatal.
