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Cabbage, Brassica oleracea, and radish, Raphanus sativus, are both members of the Brassicaceae family - VCE - SSCE Biology - Question 25 - 2009 - Paper 1
Question 25
Cabbage, Brassica oleracea, and radish, Raphanus sativus, are both members of the Brassicaceae family. The cells of each type of plant have 18 chromosomes. When thes... show full transcript
Worked Solution & Example Answer:Cabbage, Brassica oleracea, and radish, Raphanus sativus, are both members of the Brassicaceae family - VCE - SSCE Biology - Question 25 - 2009 - Paper 1
Step 1
Step 2
B. the fused cell has 18 pairs of homologous chromosomes.
Answer
This statement is correct. The fused cell combines genetic information from both the cabbage and radish, resulting in a total of 18 pairs of homologous chromosomes, which is consistent with the chromosome number of both parent species.
Step 3
C. the sterile hybrid has nine pairs of homologous chromosomes.
Answer
This statement is incorrect. The sterile hybrid, being a product of the fusion of two different species, retains the chromosome count of the parent species, amounting to 18, therefore it has 9 pairs of homologous chromosomes only if haploidity is assumed, which is not explicitly stated.
Step 4
D. gametes from the fertile plant will be identical with those of the cabbage or the radish.
Answer
This statement is incorrect. While the gametes from the fertile plant (assuming it can produce gametes) will share similarities with either cabbage or radish, they will not be identical to either, as the fertilization process involves genetic contributions from both parent species.