Problem 4, Diploid plant Species A and Species B grow in the same field, and man

Question

Problem 4, Diploid plant Species A and Species B grow in the same field, and many hybrid and mutant forms of the plants are also found there. Figure 4 is a table showing information on the number of chromosomes in Species A and Species B and in some hybrids of Species A and Species B. The table also shows the number of bivlents and univalents seen during meiosis in these plants. Use this information to answer the questions below 19) How many of the hybrid plants listed in the table contain at least one pair of homologous chromosomes? a) None b) One d) Three More than three Wo 20) How many of the hybrid plants listed in the table could have been created by fusion of a n-1 gamete from one species with a haploid gamete from the other species? d) Three e) More than three a) None c) Two 21) How many of the hybrid plants listed in the table could have been created by fusion of an n+1 gamete from one species with a haploid gamete from the other species? a) None b) One d) Three e) More than three WO 22) How many of the hybrid plants listed in the table contain no pairs of homologous chromosomes? a) None b) One d) Three e) More than three 23) A triploid version of Species A was found in the field. Which of the following is the most accurate prediction of what is expected to be present in meiotic I cells in this plant? al18 total chromosomes present as a mixture of bivalents, trivalents and univalents b) 18 total chromosomes present as 6 bivalents and 6 univalents. c) 24 total chromosomes present as a mixture of bivalents, trivalents and univalents d) 24 total chromosomes present as 8 bivalents and 8 univalents. e) 18 total chromosomes present as 6 trivalents 24) Another hybrid was isolated that was created by fusion of a diploid gamete from Species A and a diploid gamete from Species B. Which of the following is the most accurate description of what is expected to be seen in GAMETES produced by this plant? DAll of its gametes will have 13 chromosomes. b) All of its gametes will have 26 chromosomes. c) There will be variation in the number chromosomes in its gametes. d) All of its gametes will have 17 chromosomes. e) All of its gametes will have 34 chromosomes.

Explanation / Answer

19) Answer: e) more than three (four number of hybrids(hybrid 2,3,4,6))

20) Answer: b) one (hybrid 5)

21) Answer: c) two (hybrid 4 and hybrid 6)

22) Answer: two (hybrid 1 and 5)

23) Answer: a.

24)  Answer: a.

diploid gamete of species A = 12

a diploid gamete of species B = 14

so the progeny will have 26 number of the chromosome, so gametes produced here will have 13 number of chromosomes.

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