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Exam 1 review problems

Exam 1 review problems - Biology 313 Practice Questions 1 A...

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Unformatted text preview: Biology 313: September 17, 2010 Practice Questions: 1. A color—blind woman and a man with normal vision have three sons and six daughters. All the sons are color blind. Five of the daughters have normal vision, but one of them is color blind. The color—blind daughter is 16 years old, is short for her age, and has never undergone puberty. Which of the below could provide an explanation for how this girl inherited her color blindness? WHY? A. You could assume this form of color—blindness is an autosomal recessive trait. If color—blindness is an X—linked trait, you could assume non—disjunction occurred B. at Metaphase I in the female C. If color-blindness is an X—linked trait, you could assume non—disjunction occurred D at Metaphase II in the female If color—blindness is an X—linked trait, you could assume non—disjunction occurred at Metaphase I or II in the male ("A .3. g Mag w: . w W W p m 2» Mrmm‘K cm can“? “‘3 NEE”; L mmflw 1‘ ‘ mm,“ f '3 “xx :1 a 3 x K \\ € 5, @tugm' ' QMEZ’“ . .. , its; £ka (-423 We waawrfnn‘m‘nfiimuzaw‘. . ,. . r ) '1" he; N“. «221% a Mgfifies 5% “If: ,, VW a ’ a T; ' fl‘wj helm). fiawwh (2,. 2. Chickens have the ZZ-Zw of sex determination. Chicken baldness results a— from a Z—linked recessive gene. A bald rooster is mated with a normal hehufmlw‘he F1 from this cross are interbred to produce/the 1:12. Give the genotypes and phenotypes, along with their expected proportions, among the F1 and F2 Progeny. B .2. gaming {5; at 7? .v as, r‘ 0’“ 2?E :5 x «a n a f t; E? aw New} t3 / W F i L“ g, ,7} u) a 2% “2'5 l“! KT“. g: a: L W i 1 w, ““_ a. i 9 t; 2.5 sale: a“? 3» MP3. gfgb w I 51 @fia‘wj 3. How many Barr bodies would you expect to see in human cells containing the followingl‘cy omosomes? What causes X—inactivation? a. {XX/ I 19- XY (9 c. X0 0 i d. m 3 j \ \_/ fi # ...
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