If a eukaryotic cell has 20 chromosomes and it undergoes meiosis, how many cells will result, and how many chromosomes will they contain?

Type O is the recessive phenotype.  The i allele is recessive to both IA and IB.  Which of the following could be possible genotypes of the parents of a person with type O (ii) blood?

Generally speaking, a base substitution may not be as severe in consequences as a deleted nucleotide would be. 

A female who does not carry the colorblindness allele has children with a male who is colorblind.  What proportion of their children will be colorblind?

Using a codon chart,  the three codons that make stop signals are ATG, ATT, and ACT.  1st base in codon 2nd base: A 2nd base: G 2nd base: T 2nd base: C 3rd place: A Phenylaline Serine Tyrosine Cysteine A A Phenylaline Serine Tyrosine Cysteine G A Leucine  Serine Stop Stop T A Leucine Serine Stop Trytophan C G Leucine Proline Histidine Arginine A G Leucine Proline Histidine Arginine G G Leucine  Proline Glutamine Arginine T G Leucine Proline Glutamine Arginine C T Isoleucine Threonine Asparagine Serine A T Isoleucine Threonine Lysine Serine G T Isoleucine Threonine Lysine Arginine T T Methionine Threonine Aspartate Arginine C C Valine Alanine Aspartate Glycine A C Valine Alanine Glutamate Glycine G C Valine Alanine Glutamate Glycine T C Valine Alanine Glutamate Glycine C

You are a contestant on the local biology quiz show and the $10,000 questino is “How do you tell when a cell is undergoing division?”  The correct answer would be that __________. 

What is the term for two chromosomes that have the same length, shape, and genes, but do NOT have exactly the same DNA sequence?

When a fragment breaks from a chromosome and rejoins it, in a flipped orientation, the result is called a(n) ____________. 

Why do X-linked conditions appear more frequently in males than in females? 

In a human cell that is haploid, how many chromosomes are there, and of what type?