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Draw the structure of lac operon and its action when the following conditions are prevailing in the media: increased glucose, low glucose, higher c-AMP, low c-AMP, higher glucose, and high c-AMP, low glucose and High c-AMP, Higher glucose and higher allolactose?
sugar solution for preservation.
Explain why the mango slices can be kept for a longer period.
[3 marks]
(d) Explain why an athlete is advised to take an isotonic drink after a long distance run.
Diagram 2.1 Rajah 2.1
(a) (i) Based on Diagram 2.1, name the condition of the cell. Berdasarkan Rajah 2.1, namakan keadaan sel itu.
(ii) Explain your answer in (a)(i). Terangkan jawapan anda di (a)(i).
[1 marks] [1 markah]
In a particular species of plant, tall is dominant to short, and orange petals are dominant to the recessive white colour. Use T and t to symbolize the alleles for height, and F and f to symbolize the alleles for flower colour. A homozygous tall white flower is crossed with a flower heterozygous for both traits.
1.1 List the genotypes of the parents.
In peas, a gene for tall plants (T) is dominant over its allele for short plants (t). The gene for smooth peas (S) is dominant over its allele for wrinkled peas (s). The genes are not linked. Determine both phenotypic and genotypic ratios for the results of each of the following crosses:
3.4. heterozygous tall homozygous smooth x short wrinkled. [26 marks]
In peas, a gene for tall plants (T) is dominant over its allele for short plants (t). The gene for smooth peas (S) is dominant over its allele for wrinkled peas (s). The genes are not linked. Determine both phenotypic and genotypic ratios for the results of each of the following crosses:
3.3. short heterozygous smooth x heterozygous tall wrinkled. [26 marks]
In peas, a gene for tall plants (T) is dominant over its allele for short plants (t). The gene for smooth peas (S) is dominant over its allele for wrinkled peas (s). The genes are not linked. Determine both phenotypic and genotypic ratios for the results of each of the following crosses:
3.2. homozygous tall wrinkled x short heterozygous smooth. [26 marks]
In peas, a gene for tall plants (T) is dominant over its allele for short plants (t). The gene for smooth peas (S) is dominant over its allele for wrinkled peas (s). The genes are not linked. Determine both phenotypic and genotypic ratios for the results of each of the following crosses:
3.1. heterozygous tall heterozygous smooth x heterozygous tall heterozygous smooth.
