Biol 313 Exam2-red answer key

Biol 313 Exam2-red answer key - Biology 313 Exam 2 For this...

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Biology 313 – Exam 2 February 25, 2008 For this exam use the RED score sheet Fill in your student ID on the RED score sheet Choose the one alternative to best complete the statement or answer the question. 1) In birds, sex is determined by a ZW chromosome scheme that is much like the typical XY scheme seen in humans and many other organisms, however the system is reversed. Males are ZZ (similar to XX in humans) and females are ZW (similar to XY in humans). A lethal recessive allele that causes death of the embryo occurs on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male heterozygous for the lethal allele and a normal female? A) 3:1 male to female B) 1:2 male to female C) 2:1 male to female D) 1:1 male to female E) 4:3 male to female 2) Forms of inheritance that do not follow typical Mendelian patterns and that appear to be more influenced by the parent contributing the most cytoplasm to the embryo are grouped under the general heading of A) sex-linked inheritance. B) extrachromosomal inheritance. C) suppressive inheritance. D) neo-Mendelian inheritance. E) dominance and/or recessiveness. 3 )The presence of a trivalent at meiosis I is indicative of what type of chromosome alteration? A) allotetraploid B) trisomic C) autotetraploid D) pericentric inversion E) cri-du-chat syndrome 4) Which of the following best describes conjugation? 1
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