Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 36, Problem 10TYK
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What are chasmogamous flowers? Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer
Using the illustration and the assumption that half of a plant's sperm and eggs are p and half are P, one can predict that the chance of sperm p meeting egg P at fertilization is ____.
25%
75%
1/2 x 1/4
50%
100%
Suppose that 100 pollen grains land on a stigma, and 50 mature seeds are formed in the fruit. What does this indicate about the pollination process and success?
A) 100% success: 100 pollen grains grew to 50 ovules, two to each, and double fertilization occurred.
B) 100% success: Only 50% of the pollen grains germinated, but each produced 2 sperms to complete double fertilization in 50 seeds.
C) 50% success: 50 sperm fertilized 50 eggs, and 50 sperm fused with 50 polar nuclei.
D) 50% success: 50 sperm fertilized 50 eggs, and 50 sperm fused with 100 polar nuclei.
correct answer and explanation why please.
Chapter 36 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 36.1 - What are the two alternating generations of...Ch. 36.1 - Prob. 2SBCh. 36.2 - Prob. 1SBCh. 36.2 - Explain the steps leading to the formation of a...Ch. 36.2 - Trace the development of a female gametophyte,...Ch. 36.3 - Explain the sequence of events in a flowering...Ch. 36.3 - Prob. 2SBCh. 36.3 - Prob. 3SBCh. 36.4 - Prob. 1SBCh. 36.4 - Prob. 2SB
Ch. 36.5 - What is a homeobox gene? Give at least two...Ch. 36.5 - Prob. 2SBCh. 36.5 - Prob. 3SBCh. 36 - In an angiosperm life cycle, sexual reproduction...Ch. 36 - Prob. 2TYKCh. 36 - Prob. 3TYKCh. 36 - From a developmental standpoint, a seed is best...Ch. 36 - Prob. 5TYKCh. 36 - Prob. 6TYKCh. 36 - Prob. 7TYKCh. 36 - Which of the following is not an example of...Ch. 36 - Prob. 9TYKCh. 36 - Prob. 10TYKCh. 36 - Prob. 11TYKCh. 36 - Prob. 12TYKCh. 36 - Prob. 13TYKCh. 36 - Prob. 14TYKCh. 36 - Prob. 1ITDCh. 36 - Prob. 2ITDCh. 36 - Prob. 3ITD
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- A. What is double fertilization? B. What are the products of double fertilization? C. Explain the following quote “As an individual, the endosperm is unique as it has three ancestors and never leaves any descendants.” What are the three ancestors referred to in this quote? And why endosperm does not leave any descendants?arrow_forwardThe drooping, bell-like flower Aquilegia canadensis is adapted for cross-pollination. However, if the plant has not been pollinated previously, self-pollination can occur. However, if cross pollination occurs after self-pollination takes place, the pollen from cross pollination reaches the style before the pollen from self-pollination. Using course concepts and vocabulary 1) Provide a reasoning for this phenomenon. 2) Would this adaptation for reproduction be beneficial for the plant?arrow_forwardWhat is the difference between self-pollination and cross-pollination? If pollen is transferred from the stamens of a flower to the stigma of the very same flower, is that cross-pollination or self-pollination? If it is transferredfrom the stamen of one flower to the stigma of another flower on the very same plant? If it is transferred from the stamen of one flower to the stigma of another flower on a different plant, but a plant that is a clone of the first one? Animals do not have pollen, of course, but why is it that most animals never have to worry about the equivalent problem of self-fertilization? Why cannot most animals fertilize themselves?arrow_forward
- What specific RIM is being described by each of the following statements? Write your answer on the space provided before each item. Explain your answer in each letter _________C)Red-legged frogs (Rana draytonii) breed from around November to late April,while yellow-legged frogs (Rana boylii) breed from around late April to June. __________D)The structure of bucket orchid (genus Coryanthes) flowers allows pollination only by a certain species of orchid bees (tribe Euglossini). E) Offspring of hybrid cotton (genus Gossypium) plants either diearrow_forwardWhat is the relationship between pollination and fertilization in flowering plants? Select one: a. Fertilization precedes pollinations. b. If fertilization occurs, pollination would be unnecessary. c. Pollination brings gametophytes together so that fertilization can occur. d. Pollination easily occurs between plants of different species.arrow_forwardIn flowers, the structures that produce male gametophytes are called _______ ;the strcutures that produce female gametophytes are called _______ . a. pollen grains; flowers c. anthers; stigma b. stamen; carpels d. megaspores; microsporesarrow_forward
- Many flowers have both anthers and pistils. What prevents self-pollination and later self-fertilization?arrow_forwardIn wild columbine, flower morphology encourages crosspollination. However, during the middle of the receptive period of the stigma, self-pollination can occur if the flower was not previously pollinated. If cross-pollination occurs after selfpollination, then that pollen reaches the base of the style before the self-pollen. Discuss the adaptive significance of this reproduction strategy.arrow_forwardDouble fertilization is a) fertilization of an egg by two sperm. b) fertilization of two eggs by the same sperm. C) fertilization of two eggs in the same flower. d) fertilization of an egg by one sperm and an endosperm-forming cell by another sperm. e) fertilization of an egg and an endosperm-forming cell by the same sperm.arrow_forward
- Some dioecious species have the XY genotype for male andXX for female. After double fertilization, what would be thegenotypes of the embryos and endosperm nuclei?(A) embryo XY/endosperm XXX or embryo XX/endosperm XXY(B) embryo XX/endosperm XX or embryo XY/endosperm XY(C) embryo XX/endosperm XXX or embryo XY/endosperm XYY(D) embryo XX/endosperm XXX or embryo XY/endosperm XXYarrow_forwardMost wind-pollinated flowering plants have inconspicuous, non-fragrant flowers. How might nature be affected if all flowers were that way?arrow_forwardA Heterozygous plant, GgHhliJjKk is allowed to self-fertilize. What is the probability that an offspring will be GgHHliJjKk?arrow_forward
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