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velikii [3]
3 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]3 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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Which of the following is NOT one of the four main groups of macromolecules of living things?
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Answer:

D

Explanation:

polysaccharides is NOT one of the four main groups of macromolecules of living things

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How would exercising, sleeping well, eating healthy foods, and receiving recommended vaccines affect a person's immunity?
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In Drosophila, vestigial (partially formed) wings (vg) are recessive to normal long wings (vg+) and the gene for this trait is a
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Answer/ Explanation:

a. The genotype of a homozygous white eyed long winged female would be Vg+Vg+XrXr. We denote the white allele as recessive (r) because the XY male only has one copy and yet has red eyes, so the red eye trait (R) must be dominant. A homozygous red eyed vestigial winged male would have be VgVgXRY. The possible gametes for the female are Vg+Xr only. For the male, the possible gametes are VgXR or VgY

The attached punnett square shows the results of the cross. The females will all be Vg+VgXRXr. The males will all be Vg+VgXRY (must inherit Y from father). That means they will all  have normal length wings, the males will have white eyes and the females will have red eyes.

b. The F2 flies arise from intercrossing the F1, so the cross will be Vg+VgXRXr x Vg+VgXRY. The possible gametes for the mother are: Vg+XR, Vg+Xr, VgXR or VgXr. The possible gametes for the father are Vg+Xr

, Vg+Y

, VgXr

, VgY

. The attached punnet square shows this cross. The ratio of the phenotypes will be 6:6:2:2, or 3:3:1:1 (long-winged red eye: long-winged white eye: vestigial wing red eye: vestigial wing white eye), genotypes shown in the attachment.

c. F1 cross back to the mother would be Vg+VgXRY x Vg+Vg+XrXr. The genotypes are shown in the attached punnet square. The offspring will all be long-winged with white eyes. The F1 to the father would be Vg+VgXRXr x VgVgXRY. The ratio would be 3:3:1:1 long-winged red eye: long-winged white eye: vestigial wing red eye: vestigial wing white eye

Download docx
7 0
3 years ago
In 2003, the human genome was successfully mapped. This gave researchers more information about the genes that are found in the
Marizza181 [45]
. S s. A aa a. A a a
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Write a conclusion based on why online delivery is beneficial (2-3 sentences long).
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Answer:

For one, ordering online or through an app frees up staff while increasing order accuracy. It also trims the queue of customers waiting to order and even offers restaurants a means to track their guests' orders and habits.

Explanation:

(hope this helps)

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