Application Question 5-identical twin

 
Application Question 5

    Due Feb 4 by 11:59pm Points 10 Submitting a text entry box Available until Mar 26 at 1pm

This assignment was locked Mar 26 at 1pm.

Now that you've gotten to check your ideas by seeing some of your classmates' responses, let's take an opportunity to record your final thoughts for now.  Your response might be the same or different from in the previous discussion, but please re-write (or paste in) your complete answer.

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You run into your old friend, Aaron, who tells you that (strange as it sounds) he and his identical twin brother Jared got married to identical twin sisters! He says it’s going to be really exciting, because both couples just had baby girls, so his and Jared’s kids will also be identical twins!

Using your understanding of meiosis (e.g., including crossing over/recombination & independent assortment), what do you say to Aaron in response?

(Hint: since the important processes here act on pairs of chromosomes, it can be helpful to use "within pairs" or "between pairs" or "from each pair" frequently in your responses!)

 

Mostly Complete (10 pts): Describe issues related to both independent assortment and crossing over/recombination.  Both of those processes mean it's extremely unlikely Aaron and Jared will produce identical sperm, much less that those sperm will fertilize identical eggs from their partners.  Make sure response is clear that those processes occur between each pair of chromosomes (not between chromosomes from different pairs) in each individual's body.  The Week 5 lecture recording includes a discussion/clarification of this!

Partially Complete (6 pts): Explain just one of the two concepts described above.  Also note that responses will be marked only partially complete if they indicate that crossing over happens between mother/father or male/female or egg/sperm chromosomes.  Crossing over happens before fertilization within a single individual's body between that person's chromosome pairs.  Crossing over is not expected to happen between egg and sperm chromosomes after fertilization.

           Jared  and Aaron 's DNA that is passed along to their baby will include new combinations of codes due to crossing over. Crossing creates the new combinations of genetic material on chromosomes that is not possible  for these twins to create identical twin babies.  Cross over,  created their reproductive cells are made in independent assortment, there are numerous different combinations using the equation of 2 to the power of how many pairs of chromosomes they have (23), which makes more than around 8 million combinations.

        Meiosis is a division that a single cell divides twice and produces four daughter cells which  contain half the amount of genetic material from parents called sex cells (gametes).Meiosis produces cells that are genetically unique from the parents and contain only half DNA from parents.  Although the baby can inherit some traits from the parents their baby can not become identity twins liked Jared  and Aaron.