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dexar [7]
3 years ago
11

A weightlifter who practices five hours a day observes that his muscles have gotten larger. he tells you that his muscle cells a

re dividing and consequently making him stronger, so he can lift more weight. is his explanation correct? why or why not? how would you explain muscle structure to the weightlifter?
Biology
1 answer:
maksim [4K]3 years ago
7 0

His explanation is wrong.


When a person does bodybuilding, the number of his muscle cells remains the same compared to a person who does bodybuilding, the difference is that his cells will become bigger, and that is why the muscles take on an appearance bigger when a person does weightlifting.

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.. Which of the following mutations would have the potential to affect future generations of
ch4aika [34]

Answer choices:

  • A frame shift mutation in the X chromosome of a cheek cell
  • A chromosomal mutation in the Y chromosome of a kidney cell
  • A point mutation in the first chromosome of a sperm cell
  • A substitution mutation in the third chromosome of a uterus cell

Answers:

A point mutation in the first chromosome of a sperm cell

Explanation:

Only mutations that affect the germ line are passed on to the next generation. Therefore, only mutations in the egg and sperm of an individual have the potential to affect the next generation.

Mutations in cheek cells, kidney cells, and uterus cells might cause cell death or cancer. This genetic material is not passed on to the next generation, only the egg and sperm contribute this material. Therefore, only mutations here will affect the generation.

4 0
2 years ago
If a homozygous black bull is mated with a homozygous white cow and the calf is gray, this would be an example of ________. howe
I am Lyosha [343]

The first statement above is an example of incomplete dominance. If the calf has black and white spots then that’s an example of codominance.

 

Incomplete dominance is a form of transitional inheritance in which one allele for an explicit trait is not entirely expressed over its paired allele. This effects in a third phenotype in which the expressed physical trait is a mixture of the phenotypes of both alleles.

 

Codominance<span> is a form of dominance by which the alleles of a gene pair in a heterozygote are wholly expressed. This effects in offspring with a phenotype that is neither dominant or recessive. A usual example showing this type of dominance is the ABO blood group system.</span>

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4 0
3 years ago
 Joletta thinks she knows how to cure cancer. A family member of hers had cancer, but he did not die. Joletta noticed that he at
ASHA 777 [7]
Definitely C) she did not have enough information to prove her theory to be right.
6 0
2 years ago
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What is the function of the sporangium? question 11 options: a) passes characteristics from one generation to the next b) forms
Ivenika [448]

Answer:

D) Protects the developing mother spore cells

Explanation:

A structure called a sporangium is found in some plants and other creatures and is responsible for producing and storing spores. Spores, which are haploid structures made by organisms, aid in the germination and formation of new organisms.

A structure called a sporangium is found in some plants and other creatures and is responsible for producing and storing spores. Spores, haploid structures produced by organisms, aid in germination and the development of new species. They assist in the process of reproduction, in other words. What does it actually imply that they are haploid, though? Simply said, it indicates that there are just half the chromosomes needed to create a complete diploid creature. The sporangia can divide through mitosis, or cell division, to manufacture and release spores.

A single, potentially complex morphologically produced sporangium is produced by an unbranched sporophyte in mosses, liverworts, and hornworts. The majority of ferns, many lycophytes, and non-vascular plants are homosporous (only one kind of spore is produced). Some ferns, the majority of lycophytes, and some bryophytes are heterosporous (two kinds of spores are produced). These plants generate gametophytes that are functionally male or female, respectively, by the development of microspores and megaspores. Occasionally, two types of spores are generated in the same sporangium and may even form a spore tetrad together.

Microsporangia and megasporangia, two different types of sporangia, are present in the majority of heterosporous plants. All seed plants, as well as a few ferns (Salviniaceae and Marsileaceae), some lycophytes (genera Selaginella and Isoetes, as well as the extinct lepidodendrids), are heterosporous with two types of sporangia.

Sporangia can grow near the terminals of stems, along their sides, or in close proximity to leaves. In ferns, sporangia are often located on the abaxial surface of the leaf, or the underside, where they are tightly grouped into clusters called sori. An indusium, a type of structure, could be present across Sori. The sporangia of certain ferns are dispersed along with the shortened leaf segments or along (or just in from) the leaf edge.

The sporangium has an indirect involvement in sexual reproduction and an active part in asexual reproduction in several phyla of fungus. The sporangium, which has haploid nuclei and cytoplasm, develops on the sporangiophore. Each haploid nucleus and cytoplasm are encased in a hard outer membrane as the spores develop in the sporangiophore. These spores spread by wind during asexual reproduction and develop into haploid hyphae.

Although sexual reproduction in fungus differs between phyla, the sporangium indirectly contributes to sexual reproduction in some fungi. When two haploid hyphae from different individuals combine to produce a zygosporangium in response to adverse circumstances, sexual reproduction takes place in Zygomycota. The zygosporangium's haploid nuclei subsequently combine to form diploid nuclei.

When the environment is more favorable, the zygosporangium germinates, goes through meiosis, and develops into a sporangium that releases spores.

3 0
1 year ago
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Diano4ka-milaya [45]

Answer:

The balloon will expand or explode (with enough time)

Explanation:

Charles law states that the volume of a fixed gas is directly proportional to the temperature and pressure. The higher the temperature, the higher the pressure. This will raise the volume, causing the balloon to expand at the very least.

5 0
2 years ago
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