Which of the following offspring genotypes could result from fertilization of a normal haploid sperm with an oocyte that had und
ergone nondisjunction in meiosis I1? (Because a nondisjunction event in meiosis II could involve the chromosome containing gene A or the chromosome containing gene a, be sure fo consider both possibilities in your final answer ) Select all that apply.
1 answer:
Question is incomplete I have added picture of full question as attached.
Answer with Explanation:
In meiosis 1, chromosome having gene A and its homologous part having same gene would have separated. While, in meiosis 2, separation of sister chromatids take place. If there is any non-dis-junction happens will results in migration of sister chromatid into same daughter cell.
If this happens there will be two possibilities.
Firstly, production of gametes having two copies of gene A or No copy due to non-dis-junction. while in normal cell each daughter cell will have one copy of gene a in it.
Secondly, same process happens with gene a in non-dis-junction. while normally each cell have only one copy of gene a.
By considering this fact there are following offspring genotypes will be produced.
AAa
aaa
Aa
aa
oa.
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