A blog about everything in our genes
During prophase I, homologous chromosomes pair and form synapses, a step unique to meiosis. The paired chromosomes are called bivalents, and the formation of chiasmata caused by genetic recombination becomes apparent. Chromosomal condensation allows these to be viewed in the microscope. What happens during prophase 1 of meiosis? Meiosis I, the first meiotic division, begins …
Some autistic people will have high support needs, which may mean that they require full time care and support. Some people may need a bit of support with day to day activities, while others live fully independent lives. With the right support in place, all autistic people should be able to live the life they …
If gametes were produced instead by mitosis each gamete would be diploid not haploid. During fertilization of diploid gametes, the zygote would become 4n=92. With each new generation the number of chromosomes would double. Can you have diploid gametes? Diploid describes a cell that contain two copies of each chromosome. … The only exception is …
What is the most common result of trisomy? Down syndrome, Edward syndrome and Patau syndrome are the most common forms of trisomy. Children affected by trisomy usually have a range of birth anomalies, including delayed development and intellectual disabilities. What human chromosome is most commonly affected by trisomy? The most common human trisomy involves chromosome …
What causes Asperger’s syndrome? No one thing causes Asperger’s syndrome. However, research suggests that certain factors during pregnancy and after birth may put a child at higher risk of an autism spectrum disorder diagnosis. Can Aspergers be caused by parenting? Despite early theories suggesting the possibility, we now know that parenting style does not cause …
These separated sister chromatids are known from this point forward as daughter chromosomes. At the conclusion of anaphase, each end of the cell has an identical and complete set of 46 chromosomes or 23 pairs of homologous chromosomes; they are still diploid. How many chromosomes will each resulting cell contain? When the sperm and egg …
Meiosis produces 4 haploid cells. Mitosis produces 2 diploid cells. The old name for meiosis was reduction/ division. Meiosis I reduces the ploidy level from 2n to n (reduction) while Meiosis II divides the remaining set of chromosomes in a mitosis-like process (division). Is meiosis 2n or 4N? Germ cells (sperm and egg) are haploid, …
Today, mitosis is understood to involve five phases, based on the physical state of the chromosomes and spindle. These phases are prophase, prometaphase, metaphase, anaphase, and telophase. What are the 4 stages of mitosis and what happens in each? 1) Prophase: chromatin into chromosomes, the nuclear envelope break down, chromosomes attach to spindle fibres by …
If your child or a loved one’s child has autism, then they could be eligible for monetary payments from the Social Security Administration (SSA) in forms of Social Security disability benefits. The SSA gives out monthly benefits to those. How much money do you get for having an autistic child? While many children with autism …
Assume no crossing-over occurs. Sixteen different combinations. How many different gametes are formed without crossing over? During meiosis without crossing over, the alleles of two genes located on each chromosome migrate together and stay attached. We obtain, therefore, gametes that are 100% “parental”, subdivided into two types of gametes from the point of view of …