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garik1379 [7]
2 years ago
6

How do similarities in the bones of humans, dolphins, horses, and birds provide evidence for evolution?

Biology
2 answers:
Dafna11 [192]2 years ago
4 0
The similarities between bones of humans and other animals shows that every living creature on earth has a common ancestor, even if that common ancestor is as simple as a sing-celled organism.
alukav5142 [94]2 years ago
4 0

Answer:

The similarities in the bones of the human beings, dolphins, horses shows that they share a more recent common ancestors.

The bones of the human beings, dolphins, horses shows common ancestry and the basic structure of the bones is same. They are considered as homologous structures.

The bones of the human beings appear similar to the bones of other animals. This shows that during the coarse of evolution, organism have evolved.

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In tomatoes, a heterozygous plant with normal fruit and purple stems is crossed with a recessive plant having fasciated fruit an
Pani-rosa [81]

Answer:

Recombination frequency, P = 0.23.

If the recombination frequency is < 50%, genes are linked. A RF of 23% tells us that these two genes are in the same chromosome, close enough to be linked.

  • 1% of recombinations = 1 map unit
  • 23% = 23 map units

The genes for stem color and fruit type seem to be in the same chromosome, linked and 23 MP apart.

Explanation:        

In the present example, the genes for stem color and fruit type seem to be linked.

To know if two genes are linked, we must observe the progeny distribution. If individuals, whos genes assort independently, are test crossed, they produce a progeny with equal phenotypic frequencies 1:1:1:1. If we observe a different distribution, that is that phenotypes appear in different proportions, we can assume that genes are linked in the double heterozygote parent.  

In this way, we might verify which are the recombinant gametes produced by the di-hybrid, and we will be able to recognize them by looking at the phenotypes with <u>lower frequencies in the progeny</u><u>.</u>    

The following distribution of offspring is observed:

  • normal fruit, purple stems 38.5%
  • fasciated fruit green stems 38.5%
  • normal fruit, green stems 11.5%
  • fasciated fruit, purple stems 11.5%

38.5% + 38.5% + 11.5% + 11.5% = 100%

N (total number of individuals in the progeny) = 100

  • number of individuals with normal fruit, purple stems 38.5
  • number of individuals with fasciated fruit green stems 38.5
  • number of individuals with normal fruit, green stems 11.5
  • number of individuals with fasciated fruit, purple stems 11.5

To calculate the recombination frequency we will make use of the next formula: P = Recombinant number / Total of individuals. The genetic distance will result from multiplying that frequency by 100 and expressing it in map units (MU).

P = Recombinant number / Total of individuals.

P = 11.5 + 11.5 / 100

P = 0.23  

We need to know that 1% of recombinations = 1 map unit = 1cm. Also, the maximum recombination frequency is always 50%.  This means that if the recombination frequency is < 50%, genes are linked. A RF of 23% tells us that these two genes are in the same chromosome, close enough to be linked. FR 23% = 23 UM.  

 

6 0
2 years ago
Give the seven levels of obligatony catagories​
kotykmax [81]

Answer:

There are 7 obligate categories included in hierarchical classification The highest rank is the kingdom, followed by division, class, order, family, genus and species.

Explanation:

Hope this help!!

7 0
2 years ago
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Answer:

<h3>Max maximum in autotrophs and producer</h3>
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Process in which chemical energy, instead of sunlight is used to make food
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Chemosynthesis, I believe. Bacteria at the bottom of the ocean use this process for food.
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Polar molecules are<br> nonpolar molecules are<br> ---and
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A polar molecule is a molecule that has a positive and negative charge at either end.

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