Which Allele is dominant? A
Describe the genotypes of this genetic cross as a percentage of a relative ratio.
The genotypes will be AA, Aa, Aa, and aa translating to a ratio of 3:1. As a percentage, it will be 75%: 25%.
Describe the possible phenotypes as a percentage of a relative ratio.
It will be 75% normal and 25% albinism.
What is the chance that a tiger cub born of these parents will show the albino trait?
25% chance: This is because while 50 percent will be carriers, the A allele will be dominant and hence the traits won’t show.
What is the chance that a tiger cub born of these parents will show the normal tiger?
What is the chance that a tiger cub born of these parents will carry the albino allele but not show it?
Punnet square reveals two Aa; thus there is a 50% chance of carrying but not showing.
If a cub looks like a normal tiger, what can you say about its genotype?
It can either be homozygous dominant thus carrying AA genotype. Alternatively, it can be heterozygous recessive meaning it carries Aa genotype.
Describe the genotypes and phenotypes expected if an albino tiger mated with a normal-looking tiger that carries a masked albino allele?
The expected genotypes two Rr and two rr. On the other hand, while 50% of the offspring will have albinism, the other 50% will only be carriers and hence will be normal.
Did you get different results for the number of AA, Aa, and aa combinations?
Did the results match the punnet square’s predictions?
Are the results and the predicted outcomes similar?
Estimate the differences
From the results, the difference is relatively small.
How did Mendel achieve the results?
There is no standard procedure; it all depends on chance.