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Amoeba Sisters: alleles and genes

alleles and genes
Subject

AP Biology

999+ Documents
Students shared 4571 documents in this course
Level

AP

Academic year: 2023/2024
Listed booksAdvanced Mathematics: Precalculus with Discrete Mathematics and Data AnalysisAmsterdam 1275-1795Ap BiologyAuditing and Assurance Services: an Applied ApproachBacterial Pathogenesis
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nevaeh lo
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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.

  1. An allele is a form of a gene. In the cross HhSs x hhss, how many alleles does a kitten inherit from the mother? _______

  2. How many alleles does a kitten inherit from the father? _______.

  3. 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?”

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.

  1. 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)? _______________________

  2. What is the phenotype ratio of this heterozygous cross?

________(yellow, round): __________(yellow, wrinkled): ___________(green, round) : ___________(green, wrinkled)

  1. 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? _________________________________________________________
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Amoeba Sisters: alleles and genes

Subject: AP Biology

999+ Documents
Students shared 4571 documents in this course
Level:

AP

Was this document helpful?
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? _______
8. How many alleles does a kitten inherit from the father?
_______.
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?”
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)? _______________________
11. What is the phenotype ratio of this heterozygous cross?
________(yellow, round): __________(yellow, wrinkled): ___________(green, round) : ___________(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? _________________________________________________________
____________________________________________________________________________________________________
1
1
FOIL Method:
First
Outside
Inside
Last
HhSs Hhss hhSs hhss
HhSs Hhss hhSs hhss
HhSs Hsss hhSs hhss
HhSs Hhss hhSs hhss
Genotype ratio:
25 (4/16) = sinks
25 (4/16) = no sinks
phenotype ratio:
50 (8/16) = Hairy
50 (8/16) = Hairless
Mendel's law of segregation only has one blue gene.
YYRR
YyRr Yyrr yyRr yyrr
No because you wouldn't know the genotypes
yellow round
green round
green round
YYrr Yyrr
yyRR yyRr

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