10. In a test cross of a double heterozygote, each of the recombinant type gamet

Question

10.   In a test cross of a double heterozygote, each of the recombinant type gametes occurs at a frequency of 15%. The expected frequency of each of the parental type gametes is

         a) 15% b) 20% c) 35% d) 45% e) 50%.

12.    Phenylketonuria (PKU) is a recessive genetic disease caused by the p allele. Based on our discussion of this disease in lecture, which of the following statements is true a) a pp individual will always exhibit the effects of PKU, regardless of the diet that individual is raised on b) a PP will exhibit the effects of PKU if raised on a diet high in phenylalanine c) a pp individual will not exhibit the effects of PKU if raised on a diet low in phenylalanine d) the genotype of a pp individual will change to Pp when raised on a diet low in phenylalanine e) the genotype of a pp individual will change to Pp when raised on a diet high in phenylalanine

13.    Which of the following would be an appropriate measure of the phenotypic variation of a trait in a population a) the mean of the trait in the population b) the standard deviation of the trait

         c) the heritability of the trait d) the allele frequency of genes affecting the trait.

14.    Evolutionary change of a trait in a population under the effect of selection can occur only when

         a) VE > 0 b) h2 > 0 c) h2 = 0 d) VE = 0

15.    You examine body weight in a laboratory population of mice. You find that individuals fall into five discrete weight classes with mean weights of 15 grams, 20 gr., 25 gr., 30 gr., and 35 gr. The variance of weight within each class is very low, and the distribution of weights in the different weight classes do not overlap. Based on these observations you would conclude that in this population and environment

         a) body weight is a quantitative trait b) body weight is a qualitative trait   c) body weight is affected by many different genes d) body weight is affected only by environment e) a & d.

16.    In sage plants, height is affected by only one gene, T. One hundred seeds of genotype TT are grown in a field. After one month the plants are measured and are found to exhibit a continuous normal distribution of heights ranging from 4 to 12 inches. What can you conclude about this phenotypic variation? a) it must be due to genetic variation alone b) it must be due to environmental variation alone c) it is due to a combination of genetic and environmental variation d) you cannot tell the source of the variation.   

Explanation / Answer

10. each of the recombinant- 15%

Both the recombinants- 30%

Parental type gametes- 70%

Each of the parental gametes- 35%

Option c

12. a pp individual will not exhibit the effects of PKU if raised on a diet low in phenylalanine

Option c

13. appropriate measure of the phenotypic variation- heritability of the trait

Option c

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