T his exaum is worth S0 points. You will have 1 hour and 50 minutes to complete

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T his exaum is worth S0 points. You will have 1 hour and 50 minutes to complete it Short answers.(Answer your choice of 3 out of 4 questions, 6 points for this section) 1. with duble-straa led DNA, adiine and thymine bacs exi" a oqual pruponn·and eytosine and guanine boses also exist in equal propomtions. However, with single-stranded mRNA, do adenine and uracil hases hane ko exist in eoqual proportions, and do cytosine and guanine bases base to cxist in eqsal propextioas? Esplain your answer (this is the most impoctant part 2. Suppose hamen heighe is a polygenic traat, and is mainly coatrolled by three differest enes A Baad c All of the genes contribute to beight, and the more dominunt vensions of the genes a person has, the taller the person will b:. A diploid person inherins two oopics of each pene. Each genc has incomplele dominance, so Ad is tallest, Aa is inecrmediate, and au is the shonest Similarly, BBBb>, and CC> Cea Taking oll duree genes into accounl, the tallest beight onmes from the AABBCC penorype, and the shortest height comes from the aahbee genotype Suppose that a diplaid, AaRCe man marcs with a diploid, AnBtCe woman. a. Crcle the genotype that corectly describes one ofhis haploid sperm cells (ganda). AaRtCe ARC Aan (1/2 poinl) h. Give the gemctype of the ganete firoen the mun thut codes for the talles hesight (1/2 point hight (1/2 poin) c. Give the ganotype of dhe gamate from the women tet ondes for theho d Give the genotype of the shortesd, dipkoid child thet these purents can produce (/2 poi) 3. Imagine that black rabbits are homorygous for allele R. White rabbits are homozygous for allcle R d appear among the offspring of the Hetcrozygous rabbits (R'R) are gray. What crosses listed? What are the expected proportions (or percentages) of each phenotype Gray: Black: White: Black:White White Gray:_ Gniy Black: White 4. Describe three important choemical differences between DNA and mRNA. This question is asking about differences in the structures of the molecules, not about the different roks of DNA and mRNA c. Page 7

Explanation / Answer

Q1:- Explanation:- No in mRNA adenine and uracil need not to be in equal proportions and Guanine and cytosine also need not to be in equal proportions. Because mRNA is single stranded as compared to DNA so the concentration of all thebfour bases could vary depending upon the length of gene to be transcribed.

Q2:- Explanation

The cross between AaBbCc x AaBbCc will produce gamets of the following types

ABC. ABc. AbC. Abc. aBC. aBc. abC. abc

Part a) ABC

Part b) ABC gamete from man that codes for tallest height

Part c) abc gamete from woman that codes for shortest height

Part d) aabbcc genotype of diploid child with shortest genotype.

Q3:- The three important chemical differences between DNA and RNA are

I. Sugar in DNA is deoxyribose whereas in RNA its ribose sugar

II. DNA contains a base called thymine whereas in RNA thymine is replaced by Uracil.

III. DNA is double stranded whereas RNA is single stranded.

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