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3.5.6. Multiple alleles (problems solved)

Multiple alleles (problems solved). (Page 23)

So far we have only done problems with two different possible alleles for a gene. When there are more than two possible alternatives, we will speak of multiple alleles. Keep in mind that, although there are many possible alleles, the individual, being diploid, will only have two of them.

We'll start with an example of a multiple allele solved problem, but on the following pages you will find AB0 blood group problems , the most common case of multiple allelism that often appears in genetics problems.

Genetics problem 167

A series of multiple alleles govern the intensity of mouse hair color; D=full color, d diluted color; dl = is lethal in homozygosity. The order of dominance is: D>d>dl.

A full-color mouse carrying the lethal gene is paired with a dilute-colored mouse also carrying the lethal gene. What will viable offspring be like?

Genetics problem 168

The hair color of the mink can be black, platinum (grayish blue) or sapphire (light blue). A breeder, to try to understand what this variety of colors depended on, made the following crosses:

  • Black Mink x Sapphire Mink: All descendants are black.
  • Black Mink x Sapphire Mink: Half of the descendants are black and half are sapphire.
  • Black Mink x Sapphire Mink: Half of the descendants are black and half are platinum.
  • Sapphire Mink x Sapphire Mink: All descendants are sapphire in color.
  • Platinum Mink x Sapphire Mink: Half of the descendants are platinum in color and half are sapphire in color.

How would you explain these results?


         

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Biology and Geology teaching materials for Compulsory Secondary Education (ESO) and Baccalaureate students.