DNA and genetics qustions?

Question

A particular base triplet in the coding strand of DNA is TCA. What would be the triplet in the complementary strand of DNA?

A. AGT

B. TCA

C. AGU

D. GAT

E. CAT

The problem associated with replication of DNA proceeding in the 3’ > 5’ direction only, is solved by the use of:

A.Complimentary base pairing

B.Replication forks

C.The enzyme that unwinds the DNA, helicase

D.Okazaki fragments

E. The semiconservative replication of the molecule


What type of inheritance pattern is exhibited in a genetic cross if the phenotypes of two unique homozygous parents (AA and aa) are different from the phenotype of a heterozygous (Aa) offspring?

A. Pleiotropy

B.Epistasis

C. incomplete dominance

D. multiple alleles

E. selinkage

Answer 1

1. A is the only sequence complimentary to the given one.

2. I don't like the question, but the only answer that makes any sense at all would be D.

3. If the heterozygote has a phenotype different than either homozygote, you must have a situation of incomplete dominance (C).

Answer 2

Brown is dominant over blue so if the parents have two blue allele otherwise they'd have brown eyes. So, the baby boy would be blue eyed, The two different colored eyes is not unheard of. What it means is that you are a genetic mosaic (or chimera even) or that one of you eyes has damaged melanocytes and it does not produce the green pigment (green is also dominant to blue but not to brown) that your other eye does. It is interesting, there a couple of famous people that have the same condition.

Answer 3

A. AGT

D.Okazaki fragments

C. incomplete dominance