QUESTION1 The X and Y chromosomes are not homologous, and yet they still pair in

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QUESTION1 The X and Y chromosomes are not homologous, and yet they still pair in meiosis. How is it possible? O a. Due to the Y chromosome's pseudoautosomal region. Ob.Due to the SRY gene on the Y chromosome. c. Due to the process of recombination. Od. Due to X-inactivation which allows pairing during meiosis. Oe. Due to the sex-determining region of the Y chromosome. QUESTION 2 One hypothesis about the correlation between a mother's age and the increased fequency of Down's syndrome is that O a. longer exposure to environmental toxins in older mothers results in increased risk for Down's syndrome. Ob. primary oocytes have weak meiotic spindle fiber attachments to chromosomes. O c. there is a high rate of nondisjunction in male spermatogenesis. d there is a high rate of nondisjunction in oogenesis Oe. the meiotic spindle breaks down over time in the ovum.

Explanation / Answer

ANSWER ONE IS

C DUE TO THE PROCESS OF RECOMBINATION OCCURS TO THE COMBINATION OF X-Y PSEUDOAUTOSOMAL REGION RECOMBINATION

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