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aleksley [76]
3 years ago
9

How do plant roots "know" to grow downward? This is a plant response called

Biology
2 answers:
nirvana33 [79]3 years ago
4 0

Answer:

The correct answer would be A) gravitropism

Gravitropism or geotropism refers to the differential growth of a plant in response to the gravitational pull.

For example, roots show positive geotropism, that is, they grow in direction of gravitational pull.

In contrast, shoots show negative geotropism, that is, they grow in opposite direction as compared to the direction of gravitational pull.

Dima020 [189]3 years ago
3 0
A) gravitropism is how they "know"
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In a classic experiment using pea shape, Mendel conducted two separate genetic crosses. In the first cross the parent plants wer
Kamila [148]

The question is incomplete. The rest of the question is :

From these experiments, Mendel developed four hypotheses. They include all but ___________. A. One heritable factor may be dominant and mask the other factor. B. Any organism that "shows" a heritable factor must be homozygous. Eliminate C. An organism has two "heritable factors", now called genes, one from each parent. D. sperm or egg carries only one heritable factor for each trait in the offspring.

Answer:

<em>The hypothesis which is excluded is B 'Any organism that "shows" a heritable factor must be homozygous.'</em>

Explanation:

The hypothesis is wrong because even heterozygous traits are heritable.

The hypothesis mentioned in option B cannot be considered correct because Mendel's studies showed that all traits can be inherited from the parents. All factors whether dominant or recessive, homozygous or heterozygous are heritable characteristics. Mendel's study also confirmed that genes might carry homozygous or heterozygous alleles and these alleles independently assort into gametes and are heritable.

All other hypotheses are correct and their authenticity was validated after Mendel performed his experiments.

6 0
3 years ago
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Why can’t the evolutionary relationships between certain species be explained thoroughly?
vredina [299]

Answer:

Phylogeny: It is related to evolution dealings in the evolutionary development of a species. It is represented by different ways vertical or slanted.  

Phylogenesis: It refers to the evolutionary relationships among species.  

Phylogenetics: It is determination or estimation of evolutionary relationships among groups of species, organisms and genes.  

Phylogenetics is a field of biology which is used to find relationships among different organisms. This relationship is showing through a tree (used to model actual evolutionary relationship of organisms). Ancestral divided into two descendant species because closely related organisms are shown in near branches. If there is too much divergence between two species its mean they are not closely related.  

The history of speciation (one species becomes divided into more than one new species) tells us how these species are related to each other. If they evolve to be separate species relatively recently then they are "closely relative" similarly if they evolve to be separate specie long above then they are "distant relatives". For example orthologs are genes in different species that evolved from common ancestor gene by speciation; they retain same function in the course of evolution.

Explanation:

Si.

3 0
3 years ago
Horned animals have different sizes of horns. Their size of their horns can affect their ability to compete for a mate or provid
katovenus [111]
The correct answer is A. Variation.

The key word in the text is "different." There is a variety of horn sizes among horned animals.

Eliminated Answer Choices:
The answer cannot be B. Overproduction because the text does not give any information about reproducing or populations.
The answer cannot be C. Survival of fit individuals because survival of the fit is related to adaptations and the text does not mention anything about that.

Hope this helps. Good luck! :)
6 0
3 years ago
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Which statement is correct about the Krebs cycle?
Karolina [17]
C. The Krebs cycle produces electron carries for the ETC (electron transport chain)
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A scientist uses simulation because it
Mashutka [201]

It helps give a visual and physical demonstration.

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