Scientists use DNA sequencing to understand relationships among life on Earth. The chart illustrates differences between five sp
ecies and humans. Although the DNA sequence of each may vary, what statement about all six organisms is true?
1 answer:
Answer:
With respect to the differences in the DNA sequence of six species, including the human one, it is true that the DNA sequences may vary but the aminoacid sequences are identical.
Explanation:
Options for this question:
- <em>The DNA sequences may vary but the amino acid sequences are identical. </em>
- The nitrogen bases in the nucleotides must also be different in each.
- The process in producing additional DNA, replication, is identical in all six.
- The process of producing DNA, or replication, varies due to the differences in the DNA codes.
The different species that exist have specific genomes for each of them, this is the <u>genetic information contained in the DNA varies from one species to another</u>, as can be seen in the scheme (see image). However, the genetic code is universal, and does not vary from one species to another.
The genetic code is found in the RNA molecule and is a sequence of nucleotides that, organized in triplets (codons), are responsible for the synthesis of specific amino acids. An RNA molecule contains the information necessary for protein synthesis.
The scheme shows the differences of five species with respect to the human, based on the respective DNA sequences. But what it does not show is a universally accepted truth, that the nucleotide sequence encoding an amino acid is the same for each of these species.
Learn more:
Genetic code brainly.com/question/15338
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Answer:
The children that the couple may have a 25% chance of having cystic fibrosis and 75% chance of being carriers for the CF gene
Explanation:
We know that both parents are in the same situation. Let's start for example with the mother. She has one parent and one sibling with cystic fibrosis (CF). So, supposing that the allele of the gene that causes the disease is <em>"f"</em>, as the disease is autosomal recessive, both, the parent and the sibling have the genotype ff.
Also, knowing that the other parent has a normal phenotype, but the sibling has CF, we deduce that the other parent of the mother must have a <em>Ff</em>.
So, <em>despite the mother's phenotype is normal, her genotype is Ff</em> (see the Punnett square 1) Couple's parents in the attached image). In other words, she is a carrier for the CF gene.
As the parents' situation is analogous, <em>we can deduce that the father also has a genotype Ff </em>and is also a carrier for the CF gene.
Now, if we look at the Punnett square for them (see the square 2) Couple in the attached image), we see that all their children will always have at least one copy of the CF allele, <em>f</em>.
More specifically, their children have 25% chance of having cystic fibrosis and 75% chance of having a normal phenotype but being carriers of the CF gene.
