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As Dihybrid Crosses

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Biology
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Broward Community College
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AMOEBA SISTERS: VIDEO RECAP
DIHYBRID CROSSES (MENDELIAN)
Amoeba Sisters Video Recap: Dihybrid Crosses (Mendelian Inheritance)
Vocabulary practice! You probably have had enough of cats with our video. On to peas! In pea plants, yellow peas (coded for
by a dominant allele Y) are dominant to green peas (requiring two recessive alleles y). Round peas (coded for by a dominant
allele R) are dominant to wrinkly peas (requiring two recessive r alleles). These are actual pea plant traits, by the way!
For the following, please write in the genotype or phenotype. Some are filled in for you.
7. An allele is a form of a gene. In the cross HhSs x hhss, how many
alleles does a kitten inherit from the mother? ___4___
8. How many alleles does a kitten inherit from the father?
__4___.
9. Gametes, which are sex cells, carry the alleles. Why must a gamete carry one allele (represented by a letter) from
each gene? Meaning, why can’t a gamete carry an “hh” instead of an “hs” or an “Hh” instead of a “HS?
This is the idea behind Mendel’s Law of Segregation. If a gamete carried multiple alleles from the same gene (i.e. “hh”) the
offspring would be defective.
The Dihybrid Problem Solve
Read the beginning part about pea plants again. Bernard really likes growing peas in his garden, but the peas he likes are
green. He also likes them to have a wrinkled texture, because he thinks they look much more interesting that way. Please
work out a YyRr x YyRr (heterozygous cross) on the back of this sheet or on another paper while showing all work.
10. After showing your work to use as support, what is the chance that Bernard will have pea plant offspring that match the
phenotype he is looking for (green, wrinkled)? _______6.25% (1/16)__________
11. What is the phenotype ratio of this heterozygous cross?
___9___(yellow, round): ____3_____(yellow, wrinkled): ____3_____(green, round) : ____1_____(green, wrinkled)
12. If Bernard did not receive any pea plants that were green and wrinkled in actuality, would you know for sure that the
parent genotypes were incorrect? Why or why not?
Punnett squares are not entirely accurate because there is much more complexity involved with genetic inheritance. So
it can’t be known for sure if the parent genotypes were incorrect.
yyrr
Yellow, round
Green, round
Green, round
YYrr
Yyrr
yyRR
HhSs Hhss hhSs hhss
HsSs Hhss hhSs hhss
HhSs Hhss hhSs hhss
HhSs Hhss hhSs hhss

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AMOEBA SISTERS: VIDEO RECAP DIHYBRID CROSSES (MENDELIAN) Amoeba Sisters Video Recap: Dihybrid Crosses (Mendelian Inheritance) Vocabulary practice! You probably have had enough of cats with our video. On to peas! In pea plants, yellow peas (coded for by a dominant allele Y) are dominant to green peas (requiring two recessive alleles y). Round peas (coded for by a dominant allele R) are dominant to wrinkly peas (requiring two recessive r alleles). These are actual pea plant traits, by the way! For the following, please write in the genotype or phenotype. Some are filled in for you. yyrr Yello ...
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Anonymous
Excellent resource! Really helped me get the gist of things.

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