Which RNA nucleotide can pair with the Thymine (T) at the beginning of the strand? Drag it into the DNA antisense strand to make
a pair.
2 answers:
Answer:
adenylate
Explanation:
A purine base always pairs with a pyrimidine base. Thymine is a pyrimidine base which pairs with adenine. Adenine is a purine base. During RNA synthesis, as shown in the given image, "thymine" base of template DNA is paired with "adenylate" nucleotide of RNA. The adenylate is an RNA nucleotide that has adenine as its nitrogenous base.
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What phenotypic ratio would you expect as a result of a test cross between a dihybrid organism and one that is homozygous recessive for alleles at two independent loci?
a. 3:1
b. 9:3:3:1
c. 1:1:1:1
d. 1:2:1
e. 9:4:2:1
Answer:
c. 1:1:1:1
Explanation:
When a heterozygous individual for two genes is test crossed with a double homozygous recessive individual, the progeny is obtained in 1:1:1:1 phenotypic ratio. This occurs as the heterozygous dominant individual forms four types of gametes in 1:1:1:1 ratio while the homozygous recessive individual would form only one type of gamete having one recessive allele for each gene.
For example, a test cross between TtRr (tall and red) and ttrr (short and white) would produce a progeny in following ratio=
1 tall, red: 1 tall, white: 1 short, red: 1 short, white
Here, T= tall, t= short, R= red, r= white
