Hello i have 3 (1, 7 and 8)questions i\'m confused about them.. can you please h

Question

Hello i have 3 (1, 7 and 8)questions i'm confused about them.. can you please help me? Thanks

1-In organism with a haploid chromosome number of eight, how many sister chromatids are present..- in its mitotic metaphase nucleus? in its meiotic metaphase 1 nucleus? in its meiotic metaphase 2 nucleus?

7. The following is a human pedigree for a dominant autosomal trait, caused by gene A II O (a) Give the genotypes for each individual in the pedigree (b) Among the progeny arising from the marriage of individuals III-1 and III- 2, what proportion would be expected to show the trait? 8. The following is a pedigree for a rare autosomal recessive trait, phenylketonuria. II IV Please designate the genotype for each individual in the pedigree.

Explanation / Answer

1.

For 2n=8

(The separation of homologous chromosomes does not change the chromosome number or the chromatid number. Still, 8 chromosomes and 16 chromatids are there. In fact, until the completion of meiosis I, the chromosome and chromatid numbers remain the same through all stages)

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