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3 years ago

What are the three main ways that common ancestry may be shown through homologies

Biology

1 answer:

Harrizon [31]3 years ago

6 0

Answer:

Homology is a study of similar characters found in two species because of common ancestry.

Explanation:

1.Morphological homology: Species placed under same taxonomic category exhibit similar anatomical structures.

2.Ontogenetic homology: Species belongs to same taxonomic category embryological similarities

3.Molecular homology: Species show molecular similarities such as DNA,RNA and protein

An example of homology is seen in the skeletal strycture of vertebrates. That is arm of a human,leg of a cat,fin of a whale and wing of a bat.

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Study the cladogram. Which two organisms have dry skin? gorilla and shark shark and lizard lizard and tiger tiger and lamprey.

Rasek [7]

Answer:

It's C.

Explanation:

I chose B but I got it wrong. Since lizards obviously have dry skin, the other option with lizards is C. And you can also see in the cladogram that above "dry skin" is lizards and tigers.

So it's C.

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2 years ago

A girl of normal stature is born to two parents with achondroplasia who have very short stature, especially disproportionately s

IRINA_888 [86]

Answer:

Explanation:

Achondroplasia is an autosomal dominant disorder that is expressed in both homozygous and heterozygous dominant genotypes. Since two affected parents have a normal girl child, both the parents should be heterozygous carrier for the disease. Let's assume that the dominant allele "A" is responsible for the disease. Genotype of both the parents of the girl would be "Aa". The genotype of girl with normal stature is "aa". Genotype of her normal partner is "aa".

A cross betwee aa X aa would get all the progeny with "aa" genotype. Therefore, all of their children would have normal stature and there is 0% probability for them to have a child with achondroplasia.

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3 years ago

What does the Diagram of the water intake by a Bryophyte look like?

Tatiana [17]

If you want a description of Bryophyte or how it looks like is that:
It is a small green plant that is flowerless and consists of Mosses and Liverworts. It can also be referred as Embrophytes.

5 0

3 years ago

Can all creatures can have their own kingdom if they have their own species too?

vovangra [49]

No because they already have a kingdom

5 0

3 years ago

Oxidative damage to DNA can often result in the alteration of a single nucleotide.

Harman [31]

Answer:

Repair mechanism for base cleavage (BER)

Explanation:

Repair by base cleavage (BER)

The altered bases are specifically recognized by glycosylases and removed, generating an AP site. The hole is filled by a DNA polymerase that takes the healthy strand as a template. This system arises not only by exposure to external agents, but also by the cell's own activity.

In case of damage in more than one nucleotide, repair by nucleotide excision (NER) is performed.

Nucleotide excision repair (NER)

The damaged area is recognized by UvrA and B, then A and B separate and UvrC enters which forms a complex with endonuclease activity with B. This enzyme cuts the T-dimer and the gap is filled by a DNA polymerase. There is also the TC-NER system (transcription-coupled nucleotide repair system). The alteration of these mechanisms gives rise to diseases such as: Xeroderma pigmentosum, Trichotiodystrophy or Cockayne Syndrome

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3 years ago

Read 2 more answers