Need help with number 11 8. DRAWITThe diagram at right shows a cell in meiosis.

Question

Need help with number 11

8. DRAWITThe diagram at right shows a cell in meiosis. DRAW IT (a) Copy the drawing to a sepa- rate sheet of paper and label appropriate structures with these terms, drawing lines or brackets as needed: chromosome (label as du- plicated or unduplicated), centromere, kinetochore, sister chromatids, nonsister chromatids, homologous pair, homologs, chiasma, sister chromatid cohesion. (b) Describe the makeup of a haploid set and a diploid set. (c) Identify the stage of meiosis shown. LEVEL 3: SYNTHESIS/EVALUATION 9. How can you tell the cell in question 8 is undergoing meiosis, not mitosis? 10. EVOLUTION CONNECTION Many species can reproduce either asexually or sexually. What might be the evolutionary significance of the switch from asexual to sexual reproduction that occurs in some organisms when the environment becomes unfavorable? 11. SCIENTIFIC INQUIRY The diagram above represents a meiotic cell in a certain indi- vidual. A previous study has shown that the freckles gene is located at the locus marked F, and the hair-color gene is lo- cated at the locus marked H, both on the long chromosome. The individual from whom this cell was taken has inherited different alleles for each gene ("freckles" and "black hair" from one parent, and "no freckles" and "blond hair" from the other). Predict allele combinations in the gametes resulting from this meiotic event. (It will help if you draw out the rest of meiosis, labeling alleles by name.) List other possible com- binations of these alleles in this individual's gametes.

Explanation / Answer

Frekles F, no Freckles f

Black hair B, Blonde hair b

Parent 1 = FFBB

Parent 2 = ffbb

Now since it is meiosis, we need to keep in mind about crossing over too. Also, since both the gene lie very far, the chances of crossing over are also more.

Possible gametes would be= FB, fb, Fb, fB.

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