What survival advantage does a seed have that has enabled seed plants to be the most successful group of Plantae?

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Deanna HettingerLv2

28 Sep 2019

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Why is a plantâs life cycle called an alternation of generations?

Why are seed plants the most successful terrestrial plants?

Describe the differences between gymnosperms and angiosperms. Give two examples of each.

		Max	Min	Mean
Xuhua	Length	1.86	1.04	1.52
Xuhua	Width	0.94	0.53	0.71
Fuchuan	Length	1.72	0.58	0.99
Fuchuan	Width	0.95	0.51	0.69
F2	Length	1.71	0.98	1.31
F2	Width	0.94	0.6	0.73

Based on the above, select two plants that you would use to breed to begin to select for increase seed size.

a. Is it better to pick two from one variety or one each from two different varieties? Why? (2pts)

b. Based on the plants you selected, what will you expect to see in the next generation in terms of seed phenotype (will increased seed size be seen in all offspring)? (2pts)

goldraccoon931

Garden asparagus, Asparagus officinalis, produces either staminate (male) or pistillate (female) plants in about equal numbers. Occasionally, stamens develop in pistillate flowers and pistils in staminate flowers. Although these latter pistels on the male plant are usually non-functional, they sometimes produce viable seed by self-fertilization. From self-fertilization, 198 such seed were obtained. Of these, 155 were male and 43 female.

1) Wht sex-determining system is most likely in these plants?

2) Which sex is the heterogametic sex? Explain

When 25 of the male plants were crossed with female plants, 8 gave male progeny only and 17 gave progeny in a 1 male to 1 female ratio

3) Wht further information does this give you?