The pollen of seed-bearing plants and the spores of seedless vascular plants are both transported by air. How do these structures differ?
A. Pollen represents the mature multicellular male gametophyte while spores are unicellular haploid cells.
B. Pollen grains are produced by meiosis while the spores are produced by mitosis.
C. Pollen grains are haploid while spores are diploid.
D. Pollen grains are produced by male gametophyte while spores are produced by female gametophyte.
E. Pollen grains are unicellular while spores are multicellular.
The pollen of seed-bearing plants and the spores of seedless vascular plants are both transported by air. How do these structures differ?
| A. | Pollen represents the mature multicellular male gametophyte while spores are unicellular haploid cells. | |
| B. | Pollen grains are produced by meiosis while the spores are produced by mitosis. | |
| C. | Pollen grains are haploid while spores are diploid. | |
| D. | Pollen grains are produced by male gametophyte while spores are produced by female gametophyte. | |
| E. | Pollen grains are unicellular while spores are multicellular. |
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| A. | 512 | |
| B. | 9 | |
| C. | 18 | |
| D. | 128 | |
| E. | 36 |
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| A. | sister chromatids | |
| B. | germ cells | |
| C. | homologous chromosomes | |
| D. | haploid chromatids | |
| E. | centrioles |
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| B. | are expressed in all plants. | |
| C. | were absent in the F1 generation of pea plants that he used in his experiments. | |
| D. | were the only traits seen in the F2 generation of pea plants in his experiments. | |
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| A. | there is no difference. | |
| B. | in plant cells, the cell plate must also divide into two parts. | |
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| D. | plant cells have a rigid cell wall. | |
| E. | a contractile ring forms only in plant cells. |
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| A. | complete dominance | |
| B. | incomplete dominance | |
| C. | codominance | |
| D. | multiple alleles | |
| E. | recessive dominance |
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| A. | The dominant allele is masked in homozygous dominant individuals. | |
| B. | With recessive genetic disorders, if both parents are carriers, the offspring will all be affected. | |
| C. | In carriers, the recessive allele causes an intermediate phenotype. | |
| D. | In recessive genetic disorders, the mother and/or father of an affected individual must also be affected. | |
| E. | With dominant genetic disorders, the mother and/or father of an affected individual must also be affected. |
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| B. | lower layers of the dermis. | |
| C. | subcutaneous layer. | |
| D. | lower layers of the epidermis. | |
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| B. | 0 | |
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| B. | heterozygosity. | |
| C. | phenotype. | |
| D. | filial. | |
| E. | dominance. |
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| A. | chromatin | |
| B. | kinetochore | |
| C. | MPF | |
| D. | centromere | |
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| A. | telophase. | |
| B. | anaphase. | |
| C. | interphase. | |
| D. | metaphase. | |
| E. | prophase. |
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| A. | he examined and analyzed both the F1 and F2 generations. | |
| B. | he studied the parental plants to determine their differences. | |
| C. | he decided to only look at his results in an objective manner. | |
| D. | he studied a trait that had a strange inheritance pattern. | |
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| C. | ttGG x TTgg | |
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| B. | must always be the same allele. | |
| C. | separate from each other during mitosis. | |
| D. | will both wind up in either the sperm or egg. | |
| E. | move together as a unit during meiosis. |
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| A. | metaphase and telophase | |
| B. | anaphase and metaphase | |
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| A. | the principle of dihybrids. | |
| B. | multiple alleles. | |
| C. | heterozygosity. | |
| D. | incomplete dominance. | |
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| B. | always recessive. | |
| C. | the main factor determining a trait. | |
| D. | always one of a pair. | |
| E. | the dominant form of a gene. |
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| A. | spindle fibers. | |
| B. | kinetochores. | |
| C. | chromatids. | |
| D. | chromatin. | |
| E. | centromeres. |
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| B. | somatic cells. | |
| C. | germ cells. | |
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