Please answer all the questions Name Summer 2017, EXAM D. while allele is t D. L

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Please answer all the questions

Name Summer 2017, EXAM D. while allele is t D. Liheral 12. 12. Gene is to You cross two snapdragons, one with red lowers and the other with white flowers. You are told by a botanist that the red flower trait is dominant to white flower trait; however their offspring end up pink 7 B. Complete, incomplete C. Inheritance, mutation D. Code, variant A. Variant, code What is this a D. Code. 13. The Start Codon is "AUG" and a Stop Codon is "UAA." Which reading frame for the following sequence will start with the start codon and end with the stop codon? 5-CAAUGCUGGAAAAUGCCUAA-3 A. +1 Frame B. +2 Frame C. +3 Frame D. -1 Frame example of? A Codominance B. Mendelian ratio C. Incomplete dominance D. Linked genes 8, Non-disjunction occurs when: Homologous chromosomes fail to separate -- . B. Part of one chromosome gets attached to another non-homologous chromosome C. A cell turns into another kind of cell D. Non-homologous chromosomes fail to separate 14. Mendel's Principle of Segregation states: A. Alleles do not separate during gamete formation 9. When looki or tends to skip a generation, it is likely ng at a pedigree, if a trait is rare B. Alleles for different genes segregate without influencing each other A. Autosomal recessive B. Autosomal dominant C. Sex-linked recessive D. Sex-linked dominant C. All genes are linked D. Alleles of a gene separate during gamete formation 10. There are 100 pea plants and there are 35 15. If you cross two pea plants that are with yellow peas and 65 with green peas Green pea color is dominant to yellow pea color. What is the frequency of the green color heterozygous for pea color. Green color is dominant to yellow color. What ratio do you expect for their offspring? allele? A. 0.59 B. 0.41 C. 0.65 A. 2 yellow, 2 green B. 3 green, 1 yellow C. 1 green, 3 yellow D. 4 green, 0 yellow D. 0.80 16. Which of the following is NOT a 11. You counsel a couple where both are carriers for sickle-cell anemia. They would requirement of Hardy-Weinberg Equilibrium? A. No mutation like to have two children. What is the B. No gene drift C. Natural selection probability that both children will be carriers as well? A. 0.5 D. Closed population B. 0.25 C. 0.125

Explanation / Answer

7)answer--C)Incomplete dominance--The red color snapdragon flower is dominant over the white flower and forms pink color flower in F1 generation which is a result of incomplete dominance of genetic traits.

8)answer-A)Non-disjunction occurs when homologous chromosomes fail to separate during different stages of cell division or meiosis.

9)answer-C)X-linked recessive--In males, if this gene is present on X-chromosome, then it will be transferred to the female daughter only and it will not be expressed in F1 generation.Further this carrier female marries a normal male and then one male and one female have recessive X-linked genes with rare disorder in F2 generation.

10)answer-C)65 green peas and 35 yellow peas--so total frequency of green peas--65/100=0.65.

11)answer--A)0.25   Both male and female are carriers of sickle cell anaemia---so cross will be X*X x X*Y will lead to F1 generation progeny as follows--X*X*(lethal), X*Y(carrier male), X*X(carrier female), XY(normal male), carrier progeny will have a ration of 1:4=0.25.

12)answer-C)gene is to inheritance while allele is to mutation. Genes lead to the development of characters for inheritance whereas alleles undergo mutation to form new alleles.

13)answer--B)+2 frame--after leaving two nucleotides from 5' end, the start codon will be AUG and stop codon will be UAA at the 3' end of DNA fragment.

14)answer-B)Mendel principle of segregation states alleles of different genes segregate without influencing each other.

15)answer-C) cross of green , wrinkled (ggrr)(recessive)with yellow round(GGRR)(dominant)-- in F1 generation.

and after selfing of yellow peas in F1 generation, will lead to the production of 1 green and 3 yellow peas in the ratio of 1:3 in F2 generation.

16)answer--C)natural selection--If natural selection is there in a population, then it will lead to the formation of new more fit species which is not possible in Hardy-Weiberg law which states that the population should be isolated, large with no genetic drift and with no mutation for further progeny production and survival.

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