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An individual with a recessive disease-causing allele on one chromosome and a normal allele on the other chromosome is referred to as a heterozygote for that gene. Since the disease is recessive, the normal allele typically masks the effects of the recessive allele, meaning the individual usually does not exhibit symptoms of the disease. However, they can still pass the recessive allele to their offspring.
A dominant allele will mask the expression of a recessive allele when they are present together in an organism. The dominant allele will be expressed, while the recessive allele will not be visibly expressed in the organism's phenotype.
A homozygous recessive organism would have two copies of the same recessive allele for a particular gene. This means that both alleles carried by the organism would be the recessive form.
The allele not expressed would be recessive whilst the other is dominant. This would be the case in a heterozygous genotype. Hope this helps
Yes, a recessive allele needs to be paired with another recessive allele in order to be expressed. This is because recessive alleles are only expressed when an individual has two copies of the recessive allele, one from each parent. If an individual has one dominant allele and one recessive allele for a particular trait, the dominant allele will be expressed.
No, an organism with a recessive allele for a particular trait will only exhibit that form if it has two copies of the recessive allele (homozygous recessive). If it has one dominant allele, it will exhibit the dominant form of the trait.
In a dominant-recessive allele relationship, the dominant allele will be expressed phenotypically over the recessive allele. This means that even if an organism carries one dominant and one recessive allele for a particular trait, the dominant allele will determine the observable characteristic.
When the dominant and recessive traits are known, using the term "homozygous" for the recessive phenotype is redundant because it implies that both alleles are the same (rr for a recessive phenotype). It is clear that the individual is homozygous for the recessive allele by observing their phenotype.
Heterozyous
Heterozygous.
Heterozygous
An individual with a recessive disease-causing allele on one chromosome and a normal allele on the other chromosome is referred to as a heterozygote for that gene. Since the disease is recessive, the normal allele typically masks the effects of the recessive allele, meaning the individual usually does not exhibit symptoms of the disease. However, they can still pass the recessive allele to their offspring.
A recessive trait only appears in an organism when it is homozygous for that trait, meaning it has two copies of the recessive allele. This occurs when an organism inherits the recessive allele from both parents.
Heterozygous.
A dominant allele will mask the expression of a recessive allele when they are present together in an organism. The dominant allele will be expressed, while the recessive allele will not be visibly expressed in the organism's phenotype.
A homozygous recessive organism would have two copies of the same recessive allele for a particular gene. This means that both alleles carried by the organism would be the recessive form.
Complete dominance means that the dominant allele completely masks the effects of the recessive allele. The only way a recessive allele can be exhibited phenotypically is if the organism is homozygous recessive for that allele.