Has no noticeable effect on the organism's appearance when the organism is heterozygous. A sperm or egg carries only one allele for each inherited character because the two alleles for a character segregate from each other during the production of gametes. Most human genetic disorders are recessive.


What is incomplete dominance? Incomplete dominance is a form of intermediate inheritance in which one allele for a specific trait is not completely expressed over its paired allele. This results in a third phenotype in which the expressed physical trait is a combination of the phenotypes of both alleles.

when an allele has no noticeable effect on an organism?

If the two alleles of an inherited pair differ, then one determines the organism's appearance and is called the dominant allele; the other has no noticeable effect on the organism's appearance and is called the recessive allele.

What is it called when one gene contributes to more than one phenotypic trait? Pleiotropy (from Greek πλείων pleion, "more", and τρόπος tropos, "way") occurs when one gene influences two or more seemingly unrelated phenotypic traits. Such a gene that exhibits multiple phenotypic expression is called a pleiotropic gene.

How are dominant and recessive alleles related? Different versions of a gene are called alleles. Alleles are described as either dominant or recessive depending on their associated traits. Recessive alleles only show their effect if the individual has two copies of the allele (also known as being homozygous?).

When two purebred individuals differ in one character are crossed this is referred to as a? The offspring of two different purebred varieties. This cross-fertilization is called a genetic cross. Mating between purebred plants that differ in only one character. When Mendel performed a monohybrid cross between purebred parent plants and found that the F1 plants all had purple flowers.

What determines the phenotype in a heterozygote? Inheritance pattern in which a heterozygote expresses the distinct trait of both alleles. What is meant by dominant allele? The allele that determines the phenotype of a gene when the individual is heterozygous for that gene.

What is the difference between a homozygous and heterozygous individual?

Homozygous carries similar alleles of a trait. E.g. RR, rr, while heterozygous carriers dissimilar allele e.g. Rr. A homozygous individual can carry either dominant or recessive allele, but not both at a time; a Heterozygous individual has both, i.e. one dominant and one recessive allele.

When more than one gene pair is involved in an inheritance pattern it is called?

While a polygenic phenotype can occur without epistasis, if you have epistasis you must be dealing with a polygenic phenotype. Polygenic just means that there are multiple genes involved in a phenotype. Epistasis refers to situations where one allele masks the phenotypic effect of one or more alleles of another gene.

What is a family tree that shows a heritable trait?

A pedigree chart displays a family tree, and shows the members of the family who are affected by a genetic trait. This chart shows four generations of a family with four individuals who are affected by a form of colorblindness. Circles represent females and squares represent males.

What unit determines heritable characteristics?

genes. A unit that determines heritable characteristics. true-breeding. organisms that produce offspring identical to themselves if allowed to self-pollinate.

What are heterozygous alleles?

heterozygous. Genes come in pairs, called alleles, and each pair is located in a specific position (or locus) on a chromosome. If the two alleles at a locus are identical to each other, they are homozygous; if they are different from one another, they are heterozygous.

Which parent is considered to be homozygous dominant and what is the genotype?

To determine the probability of inheritance of a widow's peak (or any other dominant trait), the genotypes of the parents must be considered. For example, if one parent is homozygous dominant (WW) and the other is homozygous recessive (ww), then all their offspring will be heterozygous (Ww) and possess a widow's peak.

What is the difference between homozygous and heterozygous quizlet?

What is the difference between homozygous and heterozygous? Homozygous is having two identical alleles for a particular gene. Heterozygous is having two different alleles for a particular gene.

When would a pair of alleles be heterozygous?

Heterozygous means that an organism has two different alleles of a gene. For example, pea plants can have red flowers and either be homozygous dominant (red-red), or heterozygous (red-white). If they have white flowers, then they are homozygous recessive (white-white). Carriers are always heterozygous.

What is the difference between incomplete dominance and dominance?

Incomplete Dominance is the condition when neither of the alleles is dominant, rather combine and display a new trait by mixing of the two alleles. Co-Dominance is the condition when both the alleles of a gene are dominant, and the traits are equally expressed.