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If you know that the allele for attached earlobes is recessive and a friend of yours has attached earlobes what do you know about your friends the mothers and the fathers genotype?
If your friend has attached earlobes (recessive trait), then your friend must have two copies of the recessive allele for attached earlobes (aa). This means that both of your friend's parents must be carriers of the recessive allele (Aa) in order to pass it on. Your friend's mother and father would both have one dominant allele (A) for free-hanging earlobes and one recessive allele (a) for attached earlobes.
In the family tree below people with the recessive trait of attached earlobes are shaded gray. What must be true about the person labeled A?
Person A must carry at least one dominant allele for unattached earlobes, as they are not shaded gray and therefore do not express the recessive trait of attached earlobes. If A had two recessive alleles, they would exhibit the attached earlobe trait. Additionally, A could be homozygous dominant or heterozygous for the trait, meaning they might have a parent or sibling with attached earlobes as a result of inheriting the recessive allele.
Which alleles would a child have to inherit to have attached earlobes?
To have attached earlobes, a child must inherit two recessive alleles for the earlobe trait, typically represented as "ee." If the child inherits one dominant allele (E) for free-hanging earlobes and one recessive allele (e), they will display the free-hanging trait instead. Therefore, both parents must either be homozygous recessive (ee) or carry at least one recessive allele (Ee) for the child to have attached earlobes.
A gene is recessive when?
Most genes have two copies of each gene with dominant gene "trumping" the recessive one. The gene is recessive because it is said not to do much of anything unless paired with another recessive gene, but if paired with a dominant gene, the dominant gene wins.
Arlobes can be either attached or detached. The allele for attached earlobes is recessive (e) and the allele for detached earlobes is dominant (E). What must be true if a boy is born with attached ear?
If a boy is born with attached earlobes, he must have inherited two recessive alleles (ee), one from each parent. This means that both parents must either be carriers of the recessive allele (Ee) or express the attached earlobe phenotype themselves (ee). Therefore, at least one of the parents must have the recessive allele for attached earlobes.
Are ear lobs that are attached dominant or recessive?
It was said earlier that, "Unattached earlobes are the dominant trait, twice as many people have unattached earlobes compared to attached." There is not actually any real proof that unattached earlobes are dominant. While more people may have unattached earlobes, attached earlobes are dominant. This was proved in a pedigree which covered three generations of extended families.
What genes are recessive traits?
These traits are called dominant traits. They will overcome the recessive gene and the dominant trait will be expressed. A recessive gene needs two alleles present in its genotype to be expressed.
Both you and your sister or bother have attached earlobes yet your parents have unattached earlobes unattached earlobes are dominant over attached earlobes what are the genotypes of your parents?
If both you and your sibling have attached earlobes (aa genotype) and your parents have unattached earlobes, then your parents must both be carriers of the recessive allele for attached earlobes (Aa genotype).
What must be true if a boy is born with detached earlobes?
If a boy is born with detached earlobes, both of his parents must have detached earlobes as well, as this trait is inherited. Detached earlobes are a recessive trait, meaning that both parents must pass on the gene for detached earlobes in order for the child to have them.
If you know that the allele for attached earlobes is recessive and a friend of yours has attached earlobes what do you know about your friends the mothers and the fathers genotype?
If your friend has attached earlobes (recessive trait), then your friend must have two copies of the recessive allele for attached earlobes (aa). This means that both of your friend's parents must be carriers of the recessive allele (Aa) in order to pass it on. Your friend's mother and father would both have one dominant allele (A) for free-hanging earlobes and one recessive allele (a) for attached earlobes.
Earlobes can be either attached or detached. The allele for attached earlobes is recessive and the allele for detached earlobes is dominant. What must be true is a boy is born with attached earlobes?
He has a homozygous genotype
What must a true if a boy is born with attached earlobes?
If a boy is born with attached earlobes, it indicates that he has inherited a specific genetic trait. Attached earlobes are typically considered a recessive trait, meaning that both parents must carry the gene for it to be expressed in their child. Therefore, at least one or both of the boy's parents likely have attached earlobes or carry the allele for the trait.
What is the probability of having a child with attached earlobes when an individual with attached earlobes mates with an individual heterozygous for free earlobes?
Attached earlobes are a recessive trait. When one parent has attached earlobes and the other is heterozygous for free earlobes, the chances of any particular offspring having attached earlobes is fifty percent.
What are some examples of dominant or recessive genes?
Examples of dominant genes include brown eyes and attached earlobes, where the dominant allele will be expressed over its recessive counterpart. Recessive genes include blue eyes and detached earlobes, which will only be expressed when an individual has two copies of the recessive allele.
In the family tree below people with the recessive trait of attached earlobes are shaded gray. What must be true about the person labeled A?
Person A must carry at least one dominant allele for unattached earlobes, as they are not shaded gray and therefore do not express the recessive trait of attached earlobes. If A had two recessive alleles, they would exhibit the attached earlobe trait. Additionally, A could be homozygous dominant or heterozygous for the trait, meaning they might have a parent or sibling with attached earlobes as a result of inheriting the recessive allele.
Which alleles would a child have to inherit to have attached earlobes?
To have attached earlobes, a child must inherit two recessive alleles for the earlobe trait, typically represented as "ee." If the child inherits one dominant allele (E) for free-hanging earlobes and one recessive allele (e), they will display the free-hanging trait instead. Therefore, both parents must either be homozygous recessive (ee) or carry at least one recessive allele (Ee) for the child to have attached earlobes.
Which of these is a gene that does not express itself and is concealed by the presence of another gene of the same trait?
A recessive gene is a gene that does not express itself in the presence of a dominant gene of the same trait. When an individual inherits two recessive genes for a trait, the recessive gene will be expressed.
