16.3. Sexual reproduction in plants
A subsection of Biology, 0610, through 16. Reproduction
Listing 10 of 316 questions
For Examiner's Use The four o’clock plant, Mirabilis jalapa, can have flowers of three different colours as shown in . yellow flower crimson flower orange-red flower A student crossed some crimson-flowered plants with some yellow-flowered plants (cross 1). She collected the seeds and grew them. All of the plants that grew from these seeds had orange-red flowers. Complete the genetic diagram to explain the result of cross 1. parental phenotypes parental genotypes gametes offspring genotype offspring phenotype crimson flowers ACAC × × + yellow flowers AYAY For Examiner's Use The student then carried out three further crosses as shown in Table 4.1. Table 4.1 cross genotypes of offspring 2 offspring of cross 1 × offspring of cross 3 offspring of cross 1 × crimson-flowered plant 4 offspring of cross 1 × yellow-flowered plant Complete Table 4.1 by writing the genotypes of the offspring of crosses 2, 3 and 4, using the same symbols as in the genetic diagram in . Write the genotypes in Table 4.1. You may use the space below for any working. Flower colour in M. jalapa is not an example of the inheritance of dominant and recessive alleles. Explain how the results of the crosses show that these alleles for flower colour are not dominant or recessive. For Examiner's Use Flowers from M. jalapa were cross-pollinated. Explain the difference between self-pollination and cross-pollination. Some species of plants are self-pollinated. Discuss the long-term effects of self-pollination on the evolution of these plants.
0610_s11_qp_32
THEORY
2011
Paper 3, Variant 2
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For Examiner's Use The four o’clock plant, Mirabilis jalapa, can have flowers of three different colours as shown in . yellow flower crimson flower orange-red flower A student crossed some crimson-flowered plants with some yellow-flowered plants (cross 1). She collected the seeds and grew them. All of the plants that grew from these seeds had orange-red flowers. Complete the genetic diagram to explain the result of cross 1. parental phenotypes parental genotypes gametes offspring genotype offspring phenotype crimson flowers ACAC × × + yellow flowers AYAY For Examiner's Use The student then carried out three further crosses as shown in Table 4.1. Table 4.1 cross genotypes of offspring 2 offspring of cross 1 × offspring of cross 3 offspring of cross 1 × crimson-flowered plant 4 offspring of cross 1 × yellow-flowered plant Complete Table 4.1 by writing the genotypes of the offspring of crosses 2, 3 and 4, using the same symbols as in the genetic diagram in . Write the genotypes in Table 4.1. You may use the space below for any working. Flower colour in M. jalapa is not an example of the inheritance of dominant and recessive alleles. Explain how the results of the crosses show that these alleles for flower colour are not dominant or recessive. For Examiner's Use Flowers from M. jalapa were cross-pollinated. Explain the difference between self-pollination and cross-pollination. Some species of plants are self-pollinated. Discuss the long-term effects of self-pollination on the evolution of these plants.
0610_s11_qp_33
THEORY
2011
Paper 3, Variant 3
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Use words from the following list to complete the passage about plant reproduction. You may use each word once, more than once or not at all. asexual cotyledon diploid fertilisation gamete haploid pollination sexual testa zygote Living organisms must reproduce to replace organisms which die, and to supply more organisms to occupy new environments. Genetically identical offspring are produced from a single parent during the process of reproduction. During reproduction, a special cell called a is made by one parent and fuses with a from another parent. This process of fusion is called and may eventually lead to the development of a seed. Describe how potatoes reproduce ase xually.
0610_s14_qp_22
THEORY
2014
Paper 2, Variant 2
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shows some of the many different varieties of potato, Solanum tuberosum, that are cultivated across the world for food. All varieties of S. tuberosum are classified as the same species. Define the term species. shows a method of reproduction that some potato farmers use to produce more potato plants. parent plant potato tuber offspring plant pot not to scale Describe the advantages of the type of reproduction shown in in crop production. Potato tubers store starch. Explain why plants store starch.
0610_s19_qp_42
THEORY
2019
Paper 4, Variant 2
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Questions Discovered
316