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
A. cabbage and radish have identical chromosomes.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
This statement is not correct. While both plants have the same number of chromosomes (18), it does not necessarily mean that the chromosomes are identical. Each species carries its own unique genetic information.
Step 2
B. the fused cell has 18 pairs of homologous chromosomes.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
This statement is true. The fused cell, being a product of the hybridization of two plants each with 18 chromosomes, hence will contain 18 pairs of homologous chromosomes.
Step 3
C. the sterile hybrid has nine pairs of homologous chromosomes.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
This statement is also true. Since the sterile hybrid is formed by crossing two species, it retains half the chromosomes, making it possess nine pairs of homologous chromosomes.
Step 4
D. gametes from the fertile plant will be identical with those of the cabbage or the radish.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
This statement is incorrect. The gametes will have a mix of genetic information derived from both parent species, hence they will not be identical to those of either cabbage or radish.
