23 and 24 explain. thanks 23. An organism has a diploid number of 20 in a primar

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23 and 24 explain. thanks

23. An organism has a diploid number of 20 in a primary oocyte. (a) How many tetrads are present in prophase 1? (b) lHow many dyads are present in prophase I1? (e) How many monads migrate to each pole during anaphase 1? (10 points) 24. Indicate the probable genotype for each individual using dominant and recessive mode of inheritance of the trait expessed in the following limited pedigrees. (Each case is based on a different trait.) (20 points) (a) Autosomal recessive trait (e.g. Albinism, A/a) ' ! (b) Autosomal dominant trait (e.g. Huntington disease, H/h) Page 5 of 5

Explanation / Answer

23. The primary oocyte is in diploid condition. As the diploid cells has two homologous choromosomes, and each homologous chromosomes pair forms one tetrad, the possible number of tetrads in prophase I is 10.

As the chromosome segregation occurs in Anaphase I, the each cell in prophase II has 10 dyads.

As the chromatid segregation occurs in Anaphase II, ten monads migrate to each pole.

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