Question

Multiple Choice: The nucleotide sequence below represents a gene along the length of part of a chromosome. Below the DNA is a pool of tRNA’s with their attached amino acids: the three nucleotides represent the anticodon and the number above each anticodon symbolizes a particular amino acid attached to that tRNA. Using your knowledge of the steps involved in how genes code for proteins, determine which of the amino acid (number) sequences below would correspond with the expected polypeptide chain coded for by the gene:

	…A A T C G C A T G… Coding strand
DNA sequence:	…T T A G C G T A C… Template strand

Pool of tRNA's :

1	2	3	4	5	6	7	8
GCG	UAC	AAU	UCA	AUG	UUA	AAC	CGC

A) 3-8-5

B) 6-1-2

C) 4-8-7

D) none of the above

Choose the FALSE statement:

A) If two individuals each carry a single copy of a gene coding for an autosomal recessive trait (Dd) were to marry, their offspring would have a 25% chance of expressing the recessive phenotype.

B) Alleles are the alternate forms of a gene; they first appear in the population as a result of mutations.

C) Hemophilia is a recessive sex-linked trait: If a man with this condition marries a normal woman whose father had hemophilia, all of their male children will have this condition, and all female children will be normal.

Choose the FALSE statement:

A) Catastrophism cannot account for the diversity of life seen on the earth today because many present-day organisms do not appear in the fossil record alongside ancient forms.

B) Lamarck’s proposed mechanism for evolution was based on the inheritance of features gained during an organism’s lifetime; according to this idea organisms could purposefully generate body forms needed to survive and could later pass these on to their offspring.

C) Both Darwin and Wallace were vigorous supporters of the theory known as “evolution by inheritance of acquired characteristics”.

Answer 1

How genes code for proteins, determine which of the amino acid (number) sequences below would correspond with the expected polypeptide chain coded for by the gene:

Answer should be

DNA sequence:…T T A G C G T A C… Template strand, so according to this sequence the anticodon should be complementary tot his sequence so for :

T T A G C G T A C… Template strand

AAU CGC AUG.......Anti-codon

Looking to the given tRNA anticodon sequence, it is 3-8-5

Hemophilia is a recessive sex-linked trait: If a man with this condition marries a normal woman whose father had hemophilia, all of their male children will have this condition, and all female children will be normal.

Hemophilia is an X-linked recessive trait. In this situation, a man with single mutated gene will be affected, as he has single X chromosome copy, while female will be affected in homozygous conditions only. Here the male is affected and marries a woman who has inherited an affected single X chromosome from father and woman is normal it means she is a carrier (heterozygous). in this condition, both will have the chance of having 50% of affected and 50% of unaffected male and female children.

Both Darwin and Wallace were vigorous supporters of the theory known as “evolution by inheritance of acquired characteristics”.

Darwin and Wallace never believed in the theory of acquired characters as they have always favored the theory of Natural selection. “evolution by inheritance of acquired characteristics” was said by Lamarck and Darwin vigorously proved him wrong. As characters once acquired by an individual in a lifetime can not be pass to its future generation. The only information which can be passed is encoded in the genome of that person.