test1(mona) - -. .l h .-. .-. . . 8 8, : r, : . 1 . . , . ....

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-. .-. . 8 .l , . . . h : 8, : r, . - . . . - I- . . , . , I; 1. .1 - - , .. 8 - .- . ... .,- . , <, .. G>ENETICS (BIO S325) I Exam 7/19/06 ' SUMMER 2006 : Total points: There are 24 questions in this exam. Each question carries 5 points. ~nsweu " questions for a maximum of 120 points. Select ONE answer in questions with multiple choices. The allele c causes albinism in mice (C causes mice to be black). If the cross C/c x C/C is made, and there are 10 progeny, what is the probability that all the .$ progeny will be blac 2, - .-, 2 8, In a diploid organis2&ith 2n = 6, there are two long, two intermediate, and two short chromosomes. Which one of the following is the most accurate ,-%; ! representation of a gamete resulting from meiosis in this organism? -. 1 I i .--7 (a) .< , 4 a, I C)== $ ~. I I) -0 C)' --, -+ . ' ...- (c) .I! ...I.' q. ! i . . ! . !:.: (4 . * --+ ! (el -I>= ?? 4 4 Aa Ob ' $, L\ b aL!h A 4 [Sb '-. 0 n4n.t ala ~b ij. (1 (I (--a < ,L> 6 1 b 3. In moss, the genes A and B are expressed only in the gametophyte. A sporophyte of genotype A/a; B/b is allowed to produce gametophytes. ! ' -A & Sd (i) What proportion of will be A; B? a b of sporophytes in the next I bfb
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. . , , ., . . . - , . 4. An wer if the following statements are true or false: - . , 7 (a) omologous chromosomes cany alleles for the same genes in the same 5& C .\ elative positions. ' . ~.. b 4 _\J i 1 T (,b) Homologous chromosomes regularly exchange parts by crossing over at ' +. ,I F (c)/~omolo~ous chromosomes physically pair at mitosis. (dl? omdlogous chromosomes are found in pairs but 'they do not physically pair In interphase in a diploid cell. T (e) Homologous.chromosomes duplicate before entering prophase of mitosis such " 5 that each chromosome has two chromatids. 5. The black and yellow pigments in the coats of cats are controlled by an X-lied . pair of alleles. Females heterozygous for these alleles have areas of black and . areas of yellow in their coat (called tortoise-shell, orcalico if there are also [---- S patches of white hair). (i) A calico cat has a litter of eight kittens: 1 yellow male, 2 black males, 2 -d yellow females, and 3 calico females. Assuming there is a single father for the litter, what is his probablecolor? - .- ~--. . (ii) A yellow cat has a litter of four kittens: 1 yellow and 3 calico. Assuming there is a single father for the litter, what is the probable sex of the yellow kitten? -- --- ------ ..
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test1(mona) - -. .l h .-. .-. . . 8 8, : r, : . 1 . . , . ....

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