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Chapter 29: Q29.3-3CC. (page 632)

In Figure 29.12, if fertilization occurred between gametes from one gametophyte, how would this affect the production of genetic variation

from sexual reproduction?

Short Answer

Expert verified

If fertilization occurs between gametes from the same gametophyte, the resulting offspring will be genetically identical. Thus, it results in the formation of clones. This is because all the cells produced by a gametophyte are descents of a single spore.

Step by step solution

01

Alteration of generation

The term alteration of generation indicates the life cycle of plants in which they form by two methods: gametophyte and sporophyte. Gametophyte generation indicates the generation in which plants produce gametes for their reproduction. In sporophyte generation, plants produce spores.

02

Genetic variation in sexual reproduction

In sexual reproduction, genetic variation (change in the genetic material of an organism) occurs due to three basic methods. These are an independent assortment of chromosomes, crossing over, and random fertilization.

If fertilization occurs between gametes of the same gametophyte, clones will be produced, and genetic variation will be reduced.

03

Effect of gametophyte on genetic variation from sexual reproduction

The egg and sperm cells produced by the same gametophyte are descendants of a single spore. Hence, they are genetically similar and give rise to similar offspring.

Although crossing over and independent assortment results in genetic variation during spores production, genetic variation slows down due to fertilization between gametes of the similar gametophyte.

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Most popular questions from this chapter

Which of the following characteristics of plants is absent in their closest relatives, the charophyte algae?

(A) chlorophyll b

(B) cellulose in cell walls

(C) sexual reproduction

(D) alternation of multicellular generations

Suppose an efficient conducting system evolved in a moss that could transport water and other materials as high as a tall tree. Which of the following statements about 鈥渢rees鈥� of such a species would notbe true?

(A) Spore dispersal distances would probably increase.

(B) Females could produce only one archegonium.

(C) Unless its body parts were strengthened, such a 鈥渢ree鈥�

would probably flop over.

(D) Individuals would probably compete more effectively for

access to light.

List the key derived traits found in monilophytes and seed plants, but not in lycophytes.

EVOLUTION CONNECTION DRAW IT Draw a phylogenetic tree that represents our current understanding of evolutionary relationships between a moss, a gymnosperm, a lycophyte, and a fern. Use a charophyte alga as the outgroup. (See Figure 26.5 to review phylogenetic trees.) Label each branch point of the phylogeny with at least one derived character unique to the clade descended from the common ancestor represented by the branch point.

Based on their experimental results, the researchers added weathering of rock by non-vascular plants to simulation models of the Ordovician climate. The new models predicted decreased CO2 levels and global cooling sufficient to produce the glaciations in the Late Ordovician period. What assumptions did the researchers make in using results from their experiments in climate simulation models?
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