Answer:
1/4
Explanation:
Let the earlobe allele be represented by A. since the attached earlobe is the recessive trait, the genotype would be aa while the free earlobe would be AA. The heterozygous condition would be Aa.
Two individuals heterozygous for free earlobes mated:
Aa x Aa
AA Aa Aa aa
AA and Aa = Free earlobe = 3/4
aa = attached earlobe = 1/4
<em>Hence, the probability of the couple having a child with an attached earlobe is </em><em>1/4.</em>
Answer:
D. 3' hydroxyl group
Explanation:
The polymerization activity of DNA polymerases works in 5' to 3' direction only. This means that the DNA polymerase can add new deoxyribonucleotides to the free 3' end of the primer or existing DNA strands only. The 3' end of DNA has a free OH group that exhibits the nucleophile attack on the incoming nucleotide. The free phosphate group is present on the 5' end of a DNA strand. Therefore, DNA polymerase always adds new nucleotides to the 3' OH ends (OH= hydroxyl group).
Answer:
A,I just learned this
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