Your teacher gives you this model of transcription. Choose the statement that best describes the role of DNA in transcription.
1 answer:
Answer:
C
Explanation:
A)
DNA directs the synthesis of RNA.
B)
DNA splits into two strands of RNA.
C)
A strand of DNA is used as a template for the formation of RNA.
D)
Two strands of RNA are formed by copying each of the strands of DNA.
The correct answer would be that <u>a strand of DNA is used as a template for the formation of RNA.</u>
<em>Transcription is a process during which RNA is synthesized using DNA as a template. The coding strand of the DNA is utilized as a template for the formation of messenger RNA. During this process, the double helix structure of the DNA is unwound by an enzyme and the coding strand is bound by a short DNA strand at the beginning of a gene while another enzyme adds RNA nucleotide bases to elongate the short strand.</em>
The correct option is C.
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Answer:
The P generation has straight wings and curly wings.
The F1 generation has all straight wings.
The F2 generation has straight wings and curly wings.
Explanation:
This question involves a single gene coding for wing shape in fruit flies. The allele for straight wings (S) is dominant over the allele for curly wings (s). This means that allele "S" will mask the phenotypic expression of allele "s" in a heterozygous state.
According to the question, the cross follows all Mendel's method of crossing two true breeding parents with opposite traits. Hence, the parent generation (P generation) will be between a truebreeding straight wings parent (SS) and a truebreeding curly wings parent (ss). (See attached image for full cross).
Since the straight wing allele (S) is dominant, all the F1 offsprings will possess straight wings with the genotype: Ss, which is heterozygous.
If this F1 offsprings are self-crossed i.e. Ss × Ss, four possible offsprings in the phenotypic ratio 3 straight wings : 1 curly wing will be produced in the F2 generation. The offsprings will possess the following genotypes: SS, Ss, Ss, and ss.
Offsprings SS, Ss, and Ss will all be phenotypically straight-winged
Offsprings ss will be phenotypically curly-winged.
In overall, this means that P generation has both straight and curly wings (SS and ss), F1 generation has only straight wings (Ss), F2 generation has both straight and curly wings (SS, Ss and ss).
