Humans have a gene, t, that is involved in muscle formation of the tongue. individuals homozygous for one allele can roll their tongues, while individuals homozygous for the other allele cannot. if both parents can roll their tongues, but their child cannot, what can be said about the mode of inheritance?
Question: Humans have a gene, t, that is involved in muscle formation of the tongue. individuals homozygous for one allele can roll their tongues, while individuals homozygous for the other allele cannot. if both parents can roll their tongues, but their child cannot, what can be said about the mode of inheritance?
If both parents can roll their tongues, but their child cannot, then the mode of inheritance is autosomal recessive.
This means that the gene for tongue rolling is located on an autosome, which is a non-sex chromosome, and that both parents must be carriers of the recessive allele in order for their child to inherit the trait.
A carrier is an individual who has one copy of the recessive allele and one copy of the dominant allele. Carriers are unaffected by the trait, but they can pass the recessive allele on to their offspring.
In the case of tongue rolling, the dominant allele (T) allows individuals to roll their tongues, while the recessive allele (t) prevents them from rolling their tongues.
Since both parents can roll their tongues, they must both be carriers of the recessive allele (Tt). This means that there is a 25% chance that their child will inherit two copies of the recessive allele (tt) and be unable to roll their tongues.
Here is a Punnett square showing the possible genotypes of the offspring of two parents who are carriers of the recessive allele for tongue rolling:
Mother | Father |
---|---|
Tt | Tt |
T | Tt |
Tt | T |
tt | tt |
As you can see, there is a 25% chance that their child will inherit two copies of the recessive allele (tt) and be unable to roll their tongues.
It is important to note that this is just a basic explanation of autosomal recessive inheritance. There are other factors that can affect the mode of inheritance of a particular trait, such as incomplete dominance and gene linkage.
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