62Ecology and EvolutionAlternation of GenerationsLand plants have a two-generation life cycle called alternation of generations:1. The sporophyte (diploid) generation produces haploid spores by meiosis. Spores develop into a haploidgeneration by mitosis. Label the appropriate arrow "mitosis" in Figure 17.3a.2. The gametophyte (haploid) generation produces gametes (eggs and sperm) by mitosis. The gametes thenunite to form a diploid zygote. The zygote becomes the sporophyte by mitosis. Label the appropriate arrow"mitosis" in Figure 17.3a.In this life cycle, the two generations are dissimilar, and one dominates the other. The dominant generationis larger and exists for a longer period. Figure 17.3 contrasts the plant life cycle (alternation of generations) withthe animal life cycle (diploid life cycle).1. In the plant life cycle, meiosis occurs during the production ofhaploid spores2. In the human life cycle, meiosis occurs during the production of3. In the plant life cycle, the generation that produces gametes is (n or 2n)4. In the human life cycle, the individual that produces gametes is (n or 2n)Figure 17.3 Plant and animal life cycles.a. The alternation of generations life cycle is typical of plants. Mitosis occurs as a spore becomes a gametophyte and as thezygote becomes a sporophyte. Add mitosis to this life cycle in two places. b. The diploid life cycle is typical of animals. Addmitosis to this diagram in one location only.sporophyte(2n)individual(2n)zygotesporangiumzygotediploid (2n)FERTILIZATIONMEIOSIShaploid (n)diploid (2n)FERTILIZATIONMEIOSISgametessporehaploid (n)gametophyte(n)gametes

A diploid organism is an organism that consists of two complete sets of chromosomes (2n) in the…

2. In the human life cycle, meiosis occurs during the production of 3. In the plant life cycle, the generation that produces gametes is (n or 2n) 4. In the human life cycle, the individual that produces gametes is (n or 2n)

2. In the human life cycle, meiosis occurs during the production of 3. In the plant life cycle, the generation that produces gametes is (n or 2n) 4. In the human life cycle, the individual that produces gametes is (n or 2n)

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter25: Seedless Plants

Section: Chapter Questions

Problem 7RQ: How does a haplontic plant population maintain genetic diversity? Zygotes are produced by random...

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62
Ecology and Evolution
Alternation of Generations
Land plants have a two-generation life cycle called alternation of generations:
1. The sporophyte (diploid) generation produces haploid spores by meiosis. Spores develop into a haploid
generation by mitosis. Label the appropriate arrow "mitosis" in Figure 17.3a.
2. The gametophyte (haploid) generation produces gametes (eggs and sperm) by mitosis. The gametes then
unite to form a diploid zygote. The zygote becomes the sporophyte by mitosis. Label the appropriate arrow
"mitosis" in Figure 17.3a.
In this life cycle, the two generations are dissimilar, and one dominates the other. The dominant generation
is larger and exists for a longer period. Figure 17.3 contrasts the plant life cycle (alternation of generations) with
the animal life cycle (diploid life cycle).
1. In the plant life cycle, meiosis occurs during the production ofhaploid spores
2. In the human life cycle, meiosis occurs during the production of
3. In the plant life cycle, the generation that produces gametes is (n or 2n)
4. In the human life cycle, the individual that produces gametes is (n or 2n)
Figure 17.3 Plant and animal life cycles.
a. The alternation of generations life cycle is typical of plants. Mitosis occurs as a spore becomes a gametophyte and as the
zygote becomes a sporophyte. Add mitosis to this life cycle in two places. b. The diploid life cycle is typical of animals. Add
mitosis to this diagram in one location only.
sporophyte
(2n)
individual
(2n)
zygote
sporangium
zygote
diploid (2n)
FERTILIZATION
MEIOSIS
haploid (n)
diploid (2n)
FERTILIZATION
MEIOSIS
gametes
spore
haploid (n)
gametophyte
(n)
gametes

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