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3 years ago

Question 1 of 10

Biology

1 answer:

REY [17]3 years ago

6 0

Answer:

B. He has no E alleles.

Explanation:

In order for the boy to have an attached earlobes phenotype, he must have no E alleles, because the E is dominant. So his genotype must be ee. If he has even just a single E allele (like Ee) he will have detached earlobes, because the dominant trait will mask the expression of the recessive trait.

Why not A or D: Heterozygous Ee (one of each allele) would result in detached earlobes.

Why not C: If he has no recessive alleles, EE, he would have detached earlobes.

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How do identify veins in our body

Alexandra [31]

Answer:

Veins are blood vessels in humans, and most other animals that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart. In contrast to veins, arteries carry blood away from the heart.

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2 years ago

Why do many evolutionary biologists believe that mycorrhizal fungus made it possible for aquatic plants to make the evolutionary

mrs_skeptik [129]

Answer: The vulnerable embryo must be sheltered from desiccation and other environmental hazards. In both seedless and seed plants, the female gametophyte provides protection and nutrients to the embryo as it develops into the new generation of sporophyte.

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2 years ago

In Experiment 5, how did the shape of the epidermal cells in the outer skin surface slide compare to the shape of the epidermal

Phoenix [80]

Answer:

The correct answer is B. The cells in the outer skin surface appeared flat, whereas the cells in the cross section were not flat.

Explanation:

The epidermis is made up of five cell layers, which have different functions: Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum.

Stratum basale is the innermost germinative, single, basal layer of the epidermis composed of basal cuboidal-shaped cells. These cells are the precursor of keratinocytes, this is why this layer is also called germinativum. In this basal layer, there are also Merkel cells as well as melanocytes.

Stratum spinosum refers to the keratinocytes which produce keratin.

Stratum granulosum, this is the layer where keratinization begins. Cells produce hard granules that change to keratin and lipids as they ascend.

Stratum lucidum is conformed of densely compressed cells, which begins to flatten and appear indistinguishable between each other.

Stratum corneum is the most external layer, composed of dead, flattened cells which are released regularly in a process known as desquamation.

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3 years ago

Schoology

svetlana [45]

Answer:

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Explanation:

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sashaice [31]

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3 years ago