The part that is missing is where the traits for things like colorblindness and hemophilia exist. This meansthat if you have XY chromosomes, you are missing alleles on one of the chromosomes. So whatever alleleis on your X is expressed regardless of if being dominant or recessive. These X-Linked Traits have a specialway to note the alleles.X-Linked alleles use X and Y as their base and then the allele that notates the trait is in the top, rightcorner. For instance: Phenotype(appearance) Genotype(alleles) XY with Hemophilia XhY XX withouth Hemophilia XHXh Notice that the female has two X’s so has 2 alleles. She is not a hemophiliac, but is carrying the trait.That means she can pass the trait to her offspring.Why don’t you cross those two parents here and find the outcome:Parents: Offspring: Genotypes:Phenotypes: Is there a chance of producing an XY offspring with hemophilia? Explain your answer Will any of the XX offspring carry the trait? (Remember, carrying a trait is different fromexpressing a trait) Will any of the XY offspring be heterozygous (carriers) for that trait? Will any express it? Do you think you can complete a Punnett Square with a Sex-Linked Trait?
The part that is missing is where the traits for things like colorblindness and hemophilia exist. This means
that if you have XY chromosomes, you are missing alleles on one of the chromosomes. So whatever allele
is on your X is expressed regardless of if being dominant or recessive. These X-Linked Traits have a special
way to note the alleles.
X-Linked alleles use X and Y as their base and then the allele that notates the trait is in the top, right
corner. For instance:
| Phenotype(appearance) | Genotype(alleles) |
| XY with Hemophilia | XhY |
| XX withouth Hemophilia | XHXh |
Notice that the female has two X’s so has 2 alleles. She is not a hemophiliac, but is carrying the trait.
That means she can pass the trait to her offspring.
Why don’t you cross those two parents here and find the outcome:
Parents: Offspring:
Genotypes:
Is there a chance of producing an XY offspring with hemophilia? Explain your answer
Will any of the XX offspring carry the trait? (Remember, carrying a trait is different from
expressing a trait)
Will any of the XY offspring be heterozygous (carriers) for that trait? Will any express it?
Do you think you can complete a Punnett Square with a Sex-Linked Trait?
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