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sweet-ann [11.9K]
3 years ago
10

Deletion of a DNA base from a gene affects an organism by—

Biology
1 answer:
sergiy2304 [10]3 years ago
8 0

Answer:

Deletion of a DNA base from a gene affects an organism by changing the sequence of amino acids in a protein.

Explanation:

A DNA fragment forms a gene, with a specific sequence of nitrogenous bases, which determines the synthesis of a specific protein. When a deletion of a base occurs in such a gene, it affects:

  • Transcription of the mRNA, which will have the sequence of altered bases.
  • During translation, the mRNA codons will encode at least one different amino acid.
  • The structure of the synthesized protein, which will be altered by changes in its amino acid sequence.

In summary, the <u>deletion of a base in the DNA</u><u> will affect the </u><u>protein</u><u> to be synthesized by </u><u>changing the amino acid sequence</u><u> of its structure</u>.

The other options are not possible, because the deletion of a base in the DNA of a gene

<em>     Does not influence the number of chromosomes that the gametes will have. </em>

<em>     It does not produce long chains in the chromosomes. </em>

<em>     It does not affect the ribose structure of the nucleic acids.</em>

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Tall plants are dominant over short plants. One parent is homozygous dominant and the other is heterozygous for plant height.
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Answer:

a. all tall

Explanation:

If genotypically one of the parents is homozygous dominant and another one is heterozygous for plant height then phenotypically all their progeny will be tall.

Let us suppose, 'T' represents dominant allele and 't' represents recessive allele. Then the genotype of one parent who is homozygous dominant will be TT and genotype of another parent  who is heterozygous will be Tt.

The cross is depicted in the attachment.

Here it may also be noted that genotypically two of the progeny will be homozygous dominant while two of the progeny will be heterozygous but phenotypically all the progeny will be 'tall'.

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3 years ago
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Harrizon [31]

Answer:

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Explanation:

Most Earth events involve interaction between multiple spheres. For example, rain is the movement of water (the hydrosphere) from the atmosphere to the lithosphere where it collects in lakes, rivers, or streams. Water is an important resource for inhabitants of the biosphere.

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The nitrogen cycle occurs in all the spheres and ecosystems. It passes through rocks, water, atmosphere, plants, etc.

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Sources:

https://earthsphereslife.wordpress.com/2020/03/31/nitrogen-cycle/https://earthsphereslife.wordpress.com/2020/04/01/carbon-cycle-in-all-the-spheres/

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