Dna Rna Protein Synthesis

Question 1

What is a locus

Answer 1

Fixed points in chromosomes in which there is alleles coding for the same characteristic

Question 2

What is the genetic code?

Answer 2

The sequence of codons in mRNA which code for a specific amino acid

Question 3

The genetic code is

Answer 3

Degenerate-more than one codon can code for the same amino acid

Non overlapping-each codon is read in sequence, separate from the codon before

Universal-the genetic code is the same in all organisms

Question 4

How is dna stored in eukaryotic cells(5)

Answer 4

DNA stored as chromosomes
It is linear
Its wound around proteins called histones
Mitochondria and chloroplasts in eukaryotes also contain dna
But their dna is short and circular

Question 5

How non disjunction causes Down’s syndrome/ other named syndrome

Answer 5

Non disjunction means that the sex chromosomes fail to separate during meiosis
Results in one daughter cell having one more chromosome and other having one less
Gamete without X chromosome fertilized will result in turners syndrome

Question 6

How does does crossing over occur

Answer 6

are pairs of chromosomes associate
Chaismata form
Sections of alleles get exchanged
New combination of alleles are produced