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velikii [3]
2 years ago
15

2. All seed plants are heterosporous and produce pollen grains as well as seeds. However, there are examples of transitions betw

een seedless vascular plants (lack seeds; generally homosporous) and seed plants. What seedless vascular plants are heterosporous?
Biology
1 answer:
anzhelika [568]2 years ago
6 0

Answer:

Lycopodium which is an example of Club mosses are seedless vascular plants that are heterosporous.

Explanation:

The club mosses, or phylum Lycopodiophyta, are the earliest group of seedless vascular plants. They can either be homosporous or heterosporous

Some club mosses like Lycopodium clavatum, sporangia are arranged in clusters called strobili.

Lycopodium is heterosporous (while some club mosses are homosporus.

Heterosporus means that spores of two different sizes and sexes are produced by the sporophytes of land plants.

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tekilochka [14]
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A dihybrid cross would give in the F2 a ratio of 3:1 instead of 9:3:3:1.(assuming no crossing over) </span>
7 0
3 years ago
Some genes are important enough to be called "molecular switch" or "master" genes. What is the purpose of these genes?
trapecia [35]

Answer:

Genes called "molecular switch" or master genes have the purpose of control when other genes are expressed (option A).

Explanation:

Master gene is so named because it has the function of controlling the behavior of other genes, organizing their functions and regulating when they can be expressed.

The name of molecular switch is synonymous with the master gene, since its activation determines the genetic regulation necessary to establish cell differentiation and even the determination of the sex of some species.

The other options are not correct because:

<em>     B. Master genes do not </em><u><em>determine the organization of the genome</em></u><em> .</em>

<em>     C. </em><u><em>Regulation of cell metabolism</em></u><em> depends of substances as hormones and enzymes. </em>

<em>     D. </em><u><em>The rate of translation</em></u><em> does not depend on the activity of master genes.</em>

4 0
2 years ago
1.Earth spins on its ___________________________ (4 Points)
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Answer: Earth spins on its axis

hope this helps (:

6 0
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