A person is simultaneously heterozygous for two autosomal genetic traits: albinism and Huntington disease. Draw the chromosomes during metaphase of mitosis, meiosis I, and meiosis... A person is simultaneously heterozygous for two autosomal genetic traits: albinism and Huntington disease. Draw the chromosomes during metaphase of mitosis, meiosis I, and meiosis II, labeling the alleles' locations. Also, if there is a non-disjunction event in meiosis II affecting the metacentric chromosome, what gametes could be produced?
Understand the Problem
The question is asking to illustrate the chromosomes associated with two genetic traits during different phases of cell division (mitosis and meiosis). It requires drawing these chromosomes and labeling the alleles, and it also asks about the potential gametes resulting from a non-disjunction event during meiosis II.
Answer
Draw chromosomes in metaphase; non-disjunction yields gametes: HD+ HD+, HD, and a void chromosome.
During metaphase of mitosis, homologous chromosomes align in the center. In meiosis I, homologous chromosomes pair up, and in meiosis II, sister chromatids separate. With nondisjunction in meiosis II, gametes could be HD+ HD+ and two lacking HD+ alleles.
Answer for screen readers
During metaphase of mitosis, homologous chromosomes align in the center. In meiosis I, homologous chromosomes pair up, and in meiosis II, sister chromatids separate. With nondisjunction in meiosis II, gametes could be HD+ HD+ and two lacking HD+ alleles.
More Information
Metaphase is a stage where chromosomes align in the cell's center. Non-disjunction causes abnormal chromatid distribution, leading to unusual gamete formation.
Tips
Common mistakes include confusing chromosome types and incorrectly aligning alleles. Accurate drawing of chromosome location and allele labels is crucial.
Sources
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