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eFinal Exam Practice Test must be completed in order to access the Final Exam. s practice test is MANDATORY and the score will count as an Online Exam. Question 17 1.66 pts Cell A in the diagram has alleles 'A' and 'b' on one chromosome and alleles 'a' and 'B' on the other chromosome. Based on that, which of the following is FALSE? O The subject inherited both dominant alleles from one parent and both recessive alleles from the other parent When a dominant allele is present, the recessive trait will not be expressed Through crossing over, the subject can produce gametes that have maternal and paternal alleles on the same chromosome Gametes with either dominant alleles for both genes (AB) or recessive alleles for both genes (ab) can only result from genetic recombination O (crossing over) If these genes assort independently, there will be equal number of gametes with AB, aB, Ab, or ab genotypes 4 Previous Next Quiz saved at 1:17pm Submit Quiz

Explanation / Answer

QUESTION 17

The FALSE statement is - The subject inherited both dominant alleles from one parent and both recessive alleles from the other parent. Cell A on one chromosome has A (Dominant Allele) and b(Recessive Allele) & the other homologous chromosome has a (Recessive Allele) and B (Dominant Allele) this shows that alleles of gene A & gene B make a heterozygous allele pair. So, from one parent the subject actually received a dominant allele of gene A (A) and a recessive allele of gene B (b) same way from other parent subject received recessive allele of gene A  (a) and a dominant allele for gene B (B). Thus subject inherited both one dominant and one recessive from both the parents.

It is true that when the dominant allele is present, the recessive trait will not be expressed according to the Law Of Dominance by Mendel. So, the only dominant trait will be seen in the phenotype.

It is true that by crossing over i.e when recombination takes place, the subject can produce gametes that have paternal and maternal alleles on the same chromosome. As in crossing over, there is a chiasmata formation and when it breaks the chromosome segments are switched. (Note: Crossing over is dependant on the distance between 2 genes) So, if the paternal and maternal alleles are far enough there are chances of recombination more and they can be on the same chromosome. Along with this gametes with Dominant allele (AB) and Recessive allele(ab) can also be achieved.

According to the Law of Independent Assortment by Mendal, where genes for one trait are not inherited along with other trait. So, there will be equal number of genotype AB, Ab, aB or ab.

QUESTION 15

Effect of having a mutation occur during transcription, which is at the mRNA level. So probably a wrong nucleotide might be inserted or deleted. Because of this there will be an error in codons and in turn a faulty protein/ altered version of the protein will be produced in translation.

As the mutation is at the mRNA level, it will not be passed to the offspring and the organism will not develop the mutation.

The altered version of the protein produced which will not be functional is recognized and degraded by the cell. The cell will not commit apoptosis rather the protein will be degraded by the cell's machinery and organism will be fine.

So, the organism and cell will be fine, the cell will temporarily produce an altered version of the protein.

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