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2 years ago

Why are horses and donkeys considered different species even though they can interbreed

2 answers:

soldier1979 [14.2K]2 years ago

6 0

Horses and donkeys are considered as different species because the offspring which is produced due to the interbreeding of both the animal called as Mule.

This Mule is sterile and cannot produce offspring.

According the definition of the species, the organisms belonging to the same species should be able to interbreed and produce a viable offspring which can further reproduce among themselves.

Gennadij [26K]2 years ago

4 0

The reason is because the mule is sterile and cannot breed other mules.

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Answer:

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2. The difference affects the amino acid sequence of the protein by replacing glutamic acid (Glu) with valine (Val).

Explanation:

In sickle cell anemia, a change in the DNA nucleotide sequence is observed, where adenine is substituted by thymine, whose expression is the change in the amino acid sequence of globine β, incorporating valine instead of glutamic acid. This represents a molecular mutation - point mutation - by subtitution, which corresponds to missense mutation.

Normal hemoglobin protein in a RBC

DNA CTG ACT CCT GAG GAG AAG TCT

Amino acids Leu Thr Pro Glu Glu Lys Ser

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When GAG is transcribed to mRNA, the CUC codon is obtained, which codes for glutamic acid. Thymine substitution causes the DNA sequence to change to GTG, which is transcribed as CAC, the codon that encodes the amino acid valine. The change from glutamic acid to valine in β-globin causes an altered hemoglobin, giving the abnormal erythrocytes observed in sickle cell disease.

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~Hello there!

Your question: Assume that a cross is made between aabb and aabb plants and that all the offspring are either aabb or aabb. these results are consistent with ________.

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