1. Two Bermuda sharks heterozygous for fin size (Ss; S=short, s-long) were crossed, but none of the resulting 10 offspring had long fins. Propose TWO explanations why this could be. Include a Punnett square for this cross.

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Part 1: Understanding complex Mendelian inheritance: Answer each question below. Show
your work, including any Punnett squares you use, for all questions. Note: most trait examples
are completely fictional.
1. Two Bermuda sharks heterozygous for fin size (Ss; S=short, s-long) were crossed, but
none of the resulting 10 offspring had long fins. Propose TWO explanations why this
could be. Include a Punnett square for this cross.
2. Two parents know their blood types (phenotype), but not their genotype. Blood type is an
example of a trait that displays both codominance and multiple allele inheritance. One
parent is type B (1³), and the other is type A (I^). The parents give birth to an offspring
that has type A blood (I^).
a. With this information, is it possible to definitively determine the full genotypes of
both parents? If so, demonstrate how. If not, explain why not.
b.
What other blood types could the offspring of these parents have? Give all
possible answers and use a Punnett square to show why this is.
3. One form of color-blindness in humans is more common in males, but does occur in
females. What chromosome likely carries the gene for this trait? Explain why this trait is
more common in males. Use a Punnett square to help demonstrate your explanation.
4. The hypothesis of blended inheritance (see slides from 8/24/22) states that an
offspring's traits are an intermediate form between the two parents' traits. The
incomplete dominance pattern of inheritance seems to support this idea at first glance.
However, when you investigate this further you can see that it actually does support the
discrete trait hypothesis. Explain why this is. Hint: set up several crosses of a trait
showing incomplete dominance, and look for examples where the phenotype of the
offspring is NOT a blend of the two parents.
5. Unicorn lily flowers have four different alleles for flower color: purple, magenta, orange,
or silver. Based on the following crosses, explain the relationship between these three
alleles in terms of which are dominant, recessive, or have another relationship. In the
examples listed below, all parents are true-breeding.
Purple x magenta → All F1 offspring are purple
Silver x magenta → All F1 offspring are magenta
Orange x silver →All F1 offspring are orange
Purple x orange → All F1 offspring are purple
Orange x magenta → All F1 offspring display flowers with orange & magenta petals
SEP
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Transcribed Image Text:Chrome File Edit View History Bookmarks Profiles Tab Window Help Gmail in Dashboard YouTube moodle.millikin.edu/pluginfile.php/232272/mod_resource/content/0/4%20genetic%20crosses.pdf 4 genetic crosses Translate O New Tab 4 genetic crosses 9,304 X bHome | bartleby CH 1 / 2 82% + Part 1: Understanding complex Mendelian inheritance: Answer each question below. Show your work, including any Punnett squares you use, for all questions. Note: most trait examples are completely fictional. 1. Two Bermuda sharks heterozygous for fin size (Ss; S=short, s-long) were crossed, but none of the resulting 10 offspring had long fins. Propose TWO explanations why this could be. Include a Punnett square for this cross. 2. Two parents know their blood types (phenotype), but not their genotype. Blood type is an example of a trait that displays both codominance and multiple allele inheritance. One parent is type B (1³), and the other is type A (I^). The parents give birth to an offspring that has type A blood (I^). a. With this information, is it possible to definitively determine the full genotypes of both parents? If so, demonstrate how. If not, explain why not. b. What other blood types could the offspring of these parents have? Give all possible answers and use a Punnett square to show why this is. 3. One form of color-blindness in humans is more common in males, but does occur in females. What chromosome likely carries the gene for this trait? Explain why this trait is more common in males. Use a Punnett square to help demonstrate your explanation. 4. The hypothesis of blended inheritance (see slides from 8/24/22) states that an offspring's traits are an intermediate form between the two parents' traits. The incomplete dominance pattern of inheritance seems to support this idea at first glance. However, when you investigate this further you can see that it actually does support the discrete trait hypothesis. Explain why this is. Hint: set up several crosses of a trait showing incomplete dominance, and look for examples where the phenotype of the offspring is NOT a blend of the two parents. 5. Unicorn lily flowers have four different alleles for flower color: purple, magenta, orange, or silver. Based on the following crosses, explain the relationship between these three alleles in terms of which are dominant, recessive, or have another relationship. In the examples listed below, all parents are true-breeding. Purple x magenta → All F1 offspring are purple Silver x magenta → All F1 offspring are magenta Orange x silver →All F1 offspring are orange Purple x orange → All F1 offspring are purple Orange x magenta → All F1 offspring display flowers with orange & magenta petals SEP 28 tv A n Ex W 00 Ơ Wed Sep 28 10:38 AM ☐M :
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