Final_key bis 101

Final_key bis 101 - 1 Name:_ Last four digits of ID _ BIS...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Name:______________________________ Last four digits of ID __________________ BIS 101 - 003 Final December 10, 2010 READ THE FOLLOWING INSTRUCTIONS: Write your name legibly on each page of this exam. Show all your work. Points will be subtracted for incorrect answers in multiple-choice questions. However, you will not get a negative total score for such a question. This exam is worth 200 points. You have 120 min. to complete the exam. Good Luck!
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Name:______________________________ P a g e : 3 ________ 4 ________ 5 ________ 6 ________ 7 ________ 8 ________ 9 ________ 10 ________ 11 ________ 12 ________ Total ________
Background image of page 2
3 Name _______________________ (1) Two pure lines of barley differing in a gene for reduced plant height were crossed. The symbol for the gene is rh . The genotype of line 1 is rh 1 rh 1 and that of line 2 is rh 2 rh 2 . The two pure lines did not differ in any other gene pair affecting plant height. The mean height of pure line rh 1 rh 1 was 50 cm and of pure line rh 2 rh 2 was 100 cm. The mean height of the F 1 heterozygote rh 1 rh 2 was 65 cm. The dominance relationship between the rh1 and rh2 alleles is: (circle the correct answer) (4 points) (i) rh 1 is completely dominant over rh 2 (ii) rh 1 is incompletely dominant over rh 2 (iii) rh 2 is completely dominant over rh 1 (iv) rh 2 is incompletely dominant over rh 1 (v) rh 1 and rh 2 alleles are codominant (vi) there is no dominance relationship between rh 1 and rh 2 (2) Single allele A 1 produces 10 enzyme molecules per cell and single allele A 2 produces 100 molecules of enzyme per cell. Enzymatic reaction requires at least 180 molecules of enzyme per cell to produce the phenotype A . The phenotype is a if the number of enzyme molecules is below the 180 molecule threshold. Circle all correct answers. (6 points) (i) A 1 is completely dominant over A 2. (ii) A 2 is completely dominant over A 1 (iii) A 1 is incompletely dominant over A 2 (iv) A 2 is incompletely dominant over A 1 (v) A 2 is haplosufficient allele (vi) A 2 is haploinsufficient allele (3) Genes A and B segregate independently of each other. The dihybrid AaBb is selfed. What is the frequency of the following genotypes in the progeny? (8 points) AABB 1/4 x 1/4 = 1/16 AABb 1/4 x 1/2 = 1/8 AAbb 1/4 x 1/4 = 1/16 AaBB 1/4 x 1/2 = 1/8
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 Name _______________________ (1) Phenylketonuria (PKU) is a debilitating human recessive disorder. A couple wants to have a child but are concerned because husband’s sister has PKU and wife’s brother has PKU. Describe the situation by a pedigree diagram and assign genotypes to each member in the pedigree. What is the probability that their first child will have PKU? (10 points) Aa Aa Aa 2/3 Aa 2/3 Aa Aa 1/4 P = 2/3 x 2/3 x 1/4 = 4/36 = 1/9 (2) A snapdragon plant that bred true for white petals was crossed to a plant that bred true for purple petals, and all of the F 1 had white petals. The F 1 was selfed. Among the F 2 progeny, three phenotypes were observed in the following numbers:
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/28/2010 for the course BIS 101 taught by Professor Simonchan during the Fall '08 term at UC Davis.

Page1 / 12

Final_key bis 101 - 1 Name:_ Last four digits of ID _ BIS...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online