Multiple Alleles Flashcards
What is meant by domestic fowl
Chickens
what are the F1 and F2 generations
F1 is first generation - F2 is next generation if offspring from F1 mate
What is meant if an animal is pure bred
It has a pure genotype with e.g. a pure white strain chicken has genotype C^WC^W
How do you cross animals with multiple alleles that affect the same characteristic (co-dominance)
Normal 2 by 2 punnet square, but each gamete on the outside has 2 letters (e.g. C^B = 1 gamete and C^W = another)
What is a gene that has more than two alleles at a particular locus, though all affect the same characteristic called
allelomorphic
How many alleles can be present in an individual at any one time
Only 2 (only 2 homologous chromosomes)
Which blood types are dominant and which are recessive
I^A and I^B are codominant and I^O is recessive.
What does allele I^A code for
the production of antigen A on the surface of red blood cells
What does allele I^B code for
the production of antigen B on the surface of red blood cells
What does allele I^o code for
does not code for any antigens on the surface of red blood cells
If you have genotype I^AI^B for your blood group, what antigens will your red blood cells have and what will your blood group phenotype be
Antigens - A and B
Blood Group - Group AB
Why do we use I^A and I^B instead of A and B to represent blood types
If we used the letters A and B this would mean that they are different genes, not just different alleles on the same gene.
What should you do when representing co - dominant alleles
use one symbol to represent the gene, and then different superscripts to code for it’s different alleles. E.g. C^B
Why are some characteristics such as red-green colour blindness more common in men
Red-Green colour blindness and some other characteristics are sex linked (generally always with X chromosome) and since males only have 1 X chromosome, that chromosome must be deficient in the Red-Green colour blindness for them to avoid having it
