Why do Mendel’s experiments disprove the hypothesis of blending inheritance? a.

Question

Why do Mendel’s experiments disprove the hypothesis of blending inheritance?

a. Because the trait for both alleles appeared in the F2 generation.

b. Because the F1 generation had the trait of one of the parents, rather than an average phenotype.

c. Because parental lines bred true, having the same trait from generation to generation.

d. None of these.

Which of the following is an epigenetic mechanism that (almost) always results in gene silencing?

            a. Histone acetylation

            b. CpG methylation

            c. Histone methylation

            d. Chromatin remodeling

-Can you also tell me how RNA poly I, Poly II, and Poly III differ in function from each other?

Explanation / Answer

Answer

Q. Why do Mendel’s experiments disprove the hypothesis of blending inheritance

Answer: Option b is the right answer because the F1 generation had the trait of one of the parents, rather than an average phenotype. In F1 generation trait of one parent will dominate because of dominant alleles later in the second generation both the trait will segregate.

Q. Which of the following is an epigenetic mechanism that (almost) always results in gene silencing?

Answer: option by is the right answer because epigenetic modification in the DNA often silences the gene while modification of histone often activates the gene. Histone modification causes loose loosening od DNA and nucleosome that will help to access the various factor of gene expression while methylation in DNA attracts a lot of protein to bind them and make inaccessible for expression machinery.

RNA pol I transcribe the sRNA gene, RNA pol II transcribe the mRNA, snRNA, miRNA and snoRNA gene and RNA pol III transcribes the tRNA and 5sRNA.

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