bio sample questions

bio sample questions - Chapter 12 1 A key difference...

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Chapter 12 1) A key difference between mitosis and meiosis is: synapsis of homologous chromosomes in meiosis 2) If a typical diploid somatic cell has 32 chromosomes, how many chromosomes are expected in each gamete of that organism? 16 3) Assume that a particular human cell is examined under a microscope, and it contains 22 autosomes and a Y chromosome. This cell is most likely to be a sperm cell 4) Synapsis is a critical event in the progression of meiosis. What is the key outcome of a completed chromosomal synapsis? Side by side alignment of homologous chromosomes 5) Meiosis II is similar to mitosis in that: Sister chromatids separate during anaphase. 6) A human somatic (body) cell normally contains 46 chromosomes. How many chromosomes would be expected in a male’s meiotic prophase I cell? 46 7) Which of the following figures would most likely  represent a correct configuration of the complete  chromosomal complement in a meiotic metaphase I cell of a  female jumper ant ( Myrmecia pilosula )   female (these  animals have two different chromosomes; 2 n  = 2)? XX 8) How many different combinations of maternal and paternal chromosomes can be packaged in gametes made by an organism with a diploid chromosome number of 8 9) Name two evolutionarily significant benefits of meiosis that are not present in mitosis. reshuffling of homologous chromosomes and crossing over 10) Crossing over usually contributes to genetic variation by exchanging chromosomal segments between non-sister chromatids of homologous chromosomes 11) Genetic variation, provided through sexual reproduction, offers more opportunity for offspring to survive in changing environments. What two aspects of meiosis provide sources of such variation? crossing over and allelic exclusion Chapter 13
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1) A man and woman are both of normal pigmentation, but both have one parent who is albino (without melanin pigmentation). Albinism is an autosomal (not sex-linked) recessive trait. What is the probability that their first child will be an albino girl? 1/4 2) In tigers, a recessive allele causes a white tiger (virtual absence of fur pigmentation). If two phenotypically normal tigers that are heterozygous at this recessive gene are mated, what percentage of their offspring are expected to be white? 25% 3) A black guinea pig crossed with an albino guinea pig produced 12 black offspring. When the albino was crossed with a second black animal, 6 blacks and 6 albinos were obtained. What is the best explanation for this genetic situation? Albino is recessive; black is dominant. 4) Assuming independent assortment for all gene pairs, what is the probability that the following parents, AABbCc × AaBbCc , will produce an AaBbCc offspring? 1/8
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This note was uploaded on 05/06/2008 for the course BIO 151 taught by Professor Maskey during the Fall '08 term at North Dakota.

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bio sample questions - Chapter 12 1 A key difference...

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