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3 years ago

The ____ phylum of seedless vascular plants has about 1000 known living species, including those in the genera

Biology

2 answers:

Alisiya [41]3 years ago

5 0

Answer: Lycophyta

Explanation:

It is one of the primitive vascular plant that is club of mosses and their living fossil. These plant species are group in 6 genera.

Huperzia, Lycopodium, Lycopodiella, Selaginella( spike moss) are some of the genera of this phylum.

This phylum has more than 1200 species of the plants which is is widely distributed in the tropics. These plants depends on the mycorrhizae for obtaining nutrition as they lack the ability of photosynthesis.

dalvyx [7]3 years ago

3 0

Answer:

D)Lycophyta

Explanation:

The seedless vascular plants or the pteridophyte forms one phylum of the plant kingdom. The pteridophyte kingdom can be classified into three groups: the Sphenophytes, the pteridophytes and the Lycophytes.

The Lycophyte group contains about 1000 living species as it is the most primitive group of vascular plants. The species is characterised by the presence of the microphyll like the Selaginella and Lycopodium.

The rhizoids of the gametophyte of these plants form the mycorrhizal association with the fungi.

Thus, Option-D is the correct answer.

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3 years ago

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MariettaO [177]

Answer:

3/16

Explanation:

This question involves two different genes coding for earlobe shape and earwax quality. The alleles for attached earlobes (A) and wet earwax (E) are dominant over the alleles for free earlobes (a) and dry earwax (e).

According to this question, two humans mate who are heterozygous for both genes i.e. AaEe × AeEe. Each parent will produce the following gametes: AE, Ae, aE, ae.

Using these gametes in a punnet square (see attached image), the following proportion of offsprings will be produced:

* Attached earlobe, wet earwax (A_E_) = 9/16

* Attached earlobe, dry earwax (A_ee) = 3/16

* Free earlobe, wet earwax (aaE_) = 3/16

* Free earlobe, dry earwax (aaee) = 1/16

Hence, the probability of these parents having their first child with dry earwax (ee) and attached earlobes (A_) i.e. genotype A_ee is 3/16.

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