MYP Biology 9: Unit 5 Data Analysis #1 		Name: ___________________________
1.	Rice (Oryza sativa) is usually intolerant to sustained submergence under water, although it grows rapidly in height for a few days before dying. This is true for one variety, Oryza sativa japonica. The variety Oryza sativa indica is much more tolerant to submergence. Three genetically modified forms of O. sativa japonica, GMFA, GMFB and GMFC, were made using different fragments of DNA taken from O. sativa indica.
	The plants were then submerged for a period of 11 days. The heights of all the plants were measured at the beginning and at the end of the submergence period.

(a)	(i)	State which group of rice plants were the shortest at the beginning of the experiment.
...........................................................................................................................
(1)
(ii)	Calculate the change in height for the O. sativa japonica unmodified variety during the submergence period. Show your working.
...........................................................................................................................
...........................................................................................................................
 (2)

(b)	Deduce the general relationship between the growth of all the japonica varieties and their stated tolerance level.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
(2)
In the same experiment, the researchers hypothesized that the capacity to survive when submerged is related to the presence of three genes very close to each other on rice chromosome number 9; these genes were named Sub1A, Sub1B and Sub1C. The photograph below of part of a gel shows relative amounts of messenger RNA produced from these three genes by the submergence-intolerant variety, O.  sativa japonica, and by the submergence-tolerant variety, O. sativa indica, at different times of a submergence period, followed by a recovery period out of water.

(c)	(i)	Determine which gene produced the most mRNA on the first day of the submergence period for variety O. sativa japonica.
...........................................................................................................................
(1)
(ii)	Outline the difference in mRNA production for the three genes during the submergence period for variety O. sativa indica.
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
 (2)
(iii)	Compare the mRNA production for the three genes during the submergence period between the two varieties.
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(2)

MYP Biology 9: Unit 5 Data Analysis #2 		Name: ___________________________
1.	Gibberellin promotes both seed germination and plant growth. Researchers hypothesize that the gene GID1 in rice (Oryza sativa) codes for the production of a cell receptor for gibberellin.
The mutant variety gid1-1 for that gene leads to rice plants with a severe dwarf phenotype and infertile flowers when homozygous recessive. It is suspected that homozygous recessive gid1-1 plants fail to degrade the protein SLR1 which, when present, inhibits the action of gibberellin. The graphs show the action of gibberellin on the leaves and α-amylase activity of wild-type rice plants (WT) and their gid1-1 mutants.

(a)	(i)	State which variety of rice fails to respond to gibberellin treatment.
...........................................................................................................................
(1)
(ii)	The activity of α-amylase was tested at successive concentrations of gibberellin.
Determine the increment in gibberellin concentration that produces the greatest change in α-amylase activity in wild-type rice plants (WT).
...........................................................................................................................
...........................................................................................................................
 (1)
 (b)	Discuss the consequence of crossing gid1-1 heterozygous rice plants amongst themselves for food production.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
 (3)

2.	The diagrams show the death rate in January from influenza in Canada and the United Kingdom (UK). Canada is a very large, sparsely populated country. The United Kingdom is a densely populated island.

 (a)	(i)	Identify the year in which there were no observed deaths from influenza in either country.
...........................................................................................................................
(1)
(ii)	Calculate the total number of deaths from influenza in 1968 in Canada assuming the population size was 19.8 million.
...........................................................................................................................
(1)
(b)	Compare the death rates between Canada and the United Kingdom between 1953 and 1963.
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
(3)
(c)	Influenza is caused by a virus. Outline characteristics of a virus.
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
(2)