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If both heterozygous parents are carriers of a recessive allele for phenylketonuria the probability that a given child of these parents will have PKU is?
The probability that a given child will have PKU is 25%. This is because both parents are carriers of the recessive allele (heterozygous), so there is a 25% chance that they will each pass on the recessive allele, resulting in the child having PKU.
Suppose that a dominant allele P codes for a polka-dot tail and a recessive allele p codes for a solid colored tails?
In this scenario, individuals with at least one dominant allele (P) will display the polka-dot tail phenotype, while only those with two recessive alleles (pp) will show the solid colored tail phenotype. Therefore, the genotypes PP and Pp will result in polka-dot tails, while the genotype pp will result in solid tails. This demonstrates basic principles of Mendelian genetics, where dominant alleles mask the effects of recessive alleles.
In pea plants individuals that are Pp for the allele that code?
In pea plants, individuals that are heterozygous (Pp) for a particular allele exhibit a phenotype influenced by both the dominant (P) and recessive (p) alleles. The dominant allele typically masks the effect of the recessive allele, resulting in the dominant trait being expressed. For example, if P represents purple flowers and p represents white flowers, Pp plants will display purple flowers. This demonstrates the principles of Mendelian inheritance where dominant traits prevail in heterozygous conditions.
Does a recessive allele need another recessive allele to be expressed?
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.
What is the genotype of a pea plant that shows the recessive phenotype?
The genotype of a pea plant that shows a recessive phenotype would be homozygous for the recessive allele. Using letter symbols, it would be represented as aa.
If both heterozygous parents are carriers of a recessive allele for phenylketonuria the probability that a given child of these parents will have PKU is?
The probability that a given child will have PKU is 25%. This is because both parents are carriers of the recessive allele (heterozygous), so there is a 25% chance that they will each pass on the recessive allele, resulting in the child having PKU.
What combination of alleles could produce a trait controlled by a dominant allele?
genotype
In pea plants individuals that are Pp for the alleles that code for flower color will have purple flowers What is the phenotype?
Pp, where P represents the dominant allele and p represents the recessive allele.
What letters are given in genetics to represent the dominate allele?
capital letters, such as PP equals two dominant alleles, pp equals two recessive alleles.
What is allele masked by the dominant allele?
An allele that is masked by the dominant allele is called a recessive allele. When an individual has one dominant allele and one recessive allele, only the trait determined by the dominant allele will be expressed. The recessive allele will only be expressed if an individual has two copies of it (homozygous recessive).
Apply the term homozygous heterozygous dominant or recessive to describe plants with the genotypes PP and Pp?
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Suppose that a dominant allele P codes for a polka-dot tail and a recessive allele p codes for a solid colored tails?
In this scenario, individuals with at least one dominant allele (P) will display the polka-dot tail phenotype, while only those with two recessive alleles (pp) will show the solid colored tail phenotype. Therefore, the genotypes PP and Pp will result in polka-dot tails, while the genotype pp will result in solid tails. This demonstrates basic principles of Mendelian genetics, where dominant alleles mask the effects of recessive alleles.
Is albinism controlled by a dominant allele or by a recessive allele?
Recessive allele.
Does a recessive allele need another recessive allele to be expressed?
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.
In pea plants individuals that are Pp for the allele that code?
In pea plants, individuals that are heterozygous (Pp) for a particular allele exhibit a phenotype influenced by both the dominant (P) and recessive (p) alleles. The dominant allele typically masks the effect of the recessive allele, resulting in the dominant trait being expressed. For example, if P represents purple flowers and p represents white flowers, Pp plants will display purple flowers. This demonstrates the principles of Mendelian inheritance where dominant traits prevail in heterozygous conditions.
What is the genotype of a pea plant that shows the recessive phenotype?
The genotype of a pea plant that shows a recessive phenotype would be homozygous for the recessive allele. Using letter symbols, it would be represented as aa.
What is the term for an allele that is not expressed in the phenotype of a heterozygous individual?
incomplete dominance source: PH Bio textbook
