Question

Pooh had a colony of tiggers whose stripes went across the body. His American pen-pal, Yogi, sent him a tigger whose stripes ran lengthwise. When Pooh crossed it with one of his own animals, he obtained plaid tiggers. Interbreeding among the plaid tiggers produced litters of a majority of plaid members, but some crosswise- and lengthwise-striped animals were also produced. Diagram the crosses made Pooh, showing the genotypes of the tiggers which account for the coat patterns observed.

Answer 1

In this case, the parental are lengthwise stripes (genotype ls/ls) and plaid stripes (genotype Ps/Ps), the F1 is plaid (100%) and F2 is plaid (75%) and lengthwise (25%). It is a Mendelian inheritance pattern.

Mendelian inheritance and complete dominance

Complete dominance occurs when the dominant allele (in this case, the plaid stripe trait) completely masks the recessive allele (lengthwise stripes) in heterozygous individuals.

The cross between tigers having lengthwise stripes (genotype ls/ls) and plaid stripes (genotype Ps/Ps) will produce an F1 100% having the plaid stripes (genotype Ps/ls) trait because this trait is dominant.

In the F2 obtained by crossing heterozygous plaid stripes individuals (genotype Ps/ls), the recessive trait 'lengthwise stripes' will be observed (again) in a proportion of 3:1.

In this case:

• P >> lengthwise stripes x plaid stripes
• F1 >> 100% plaid stripes
• F2 >> plaid stripes (75%) and lengthwise-stripes (25%)

Learn more about Mendelian inheritance here:

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