Today’s A – Z Challenge post is brought to you by the letter “Y”

A to Z Challenge

I am so excited to take part in this, my second, A – Z Challenge!  Last year I did the challenge using “recipes” as my inspiration.  Well, this year I’m going to draw on my nursing background and use “parts of the human body” as my inspiration!  Hmmm…a part of the body that starts with “Q”, “X” or “Z”….

It should be a lot of fun and I’m looking forward to seeing how everyone interprets the Challenge!

So, without further ado,  “Y”  is for Y-chromosome: 

The Y chromosome is what makes guys, well, guys.

Among chromosomes, the Y is a bit of a celebrity, something a little different. Among scientists, the Y is infamous for containing some of the most complex regions to sequence in the human genome.

A - Z Challenge

Photo attribution:

  • Chromosomes are long pieces of DNA found in the nucleus of cells. DNA is the material that holds genes and is considered the building block of the human body.
  • Chromosomes come in pairs. Normally, each cell in the human body has 23 pairs of chromosomes (46 total chromosomes). Half come from the mother; the other half come from the father.
  • Two of the chromosomes (the X and the Y chromosome) determine if your gender. They are called sex chromosomes
  • Females have 2 X chromosomes.  Males have 1 X and 1 Y chromosome.
  • The mother always contributes an X chromosome to the child. The father may contribute an X or a Y.   Therefore, it is the chromosome from the father that determines the gender of the child.
  • the Y chromosome contains a gene, SRY, which is responsible for the development of a fetus into a male. Other genes on the Y chromosome are important for male fertility.

Y is also for:

yellow marrow Specialized lipid storage tissue within bone cavities.

The information contained in this post was obtained from Genetics Home Reference,  Genome News Network, Nature, Medline Plus and McGraw-Hill Applied Biology Resource Center.


  1. That’s a great post for ‘Y’! Who knew it was up to the guy to produce a male or female child? So…we girls can’t be blamed for not producing a son, like a lot of the guys want. lol
    Kathy at Oak Lawn Images

  2. I have always been fascinated by chromosomes and the heredity thing!! Thanks for this, and for all the informative posts on the A-Z Challenge. Some were a “refresher course” and others were total learning experiences. It has been….. what can I say…. a “challenge”!!!!
    Patricia, Sugar & Spice & All Things ? Nice

  3. Thanks for your kind comment on my Myotonic Dystrophy blog and post. I do appreciate the feedback on this new blog. I now have a ‘follow’ button.
    Myotonic Dystrophy-Our Family’s Journey

  4. Hello! Stopping by for the A to Z Challenge. Interesting post for the letter Y.

    • Monica says:

      Hi Suzanne, Phew…the Challenge is over, but it was a lot of fun…I’m already thinking about next year, are you??

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