Q1: If in meiosis I, chromosome number 21 underwent aNONDISJUNCTION, what could be the chromosome constitution of theresulting egg?

Q2: If in meiosis I, chromosome number 21 underwent aNONDISJUNCTION, what could be the chromosome constitution of theresulting zygote? Assume that the egg is fertilized by a normalsperm.

Q3: If in meiosis I, chromosome number 21 underwent aNONDISJUNCTION, what could be the chromosome constitution of theresulting newborn? Assume that the egg is fertilized by a normalsperm.

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Jamar FerryLv2

13 Dec 2018

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1. What kind of error inMeiosis could lead to two copies of asingle chromosome in a sperm or egg ratherthan the expected one?

2. Union of a sperm with twocopies of chromosome 16 with an egg with the expected one copy willyield a zygote with three copies of chromosome 16. Why is thepresence of three copies of chromosome 16 likely to belethal?

3. If a horse and donkey aremated, the resulting animal (a mule) is diploid but sterile. Why isit sterile?