IGCSE Biology

Topics: DNA, Gene, Bacteria Pages: 4 (715 words) Published: September 21, 2013
1.Plant breeders wanted to produce a better variety of tomato by selective breeding. Two plants, of the varieties Tangella and Piranto, were crossed. (a)Some flowers of each variety were covered with cellophane bags. The diagram shows a covered flower and a brush.

(i)Explain why some flowers were covered with cellophane bags during the selective breeding. .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... (2)

(ii)Suggest why a brush was needed.
.......................................................................................................................... .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... (2)

(b)Information about each variety of tomato is shown in the table.

Which features of Piranto would the plant breeders wish to see in the new breed of tomato? .................................................................................................................................... (1)

(Total 5 marks)

2.The diagrams show stages in the transfer and copying of the gene for growth hormone.

(a)(i)Name the donor and recipient organisms for this gene transfer. donor...
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