When a heterozygote has an intermediate phenotype?

However, sometimes the heterozygote displays a phenotype that is an intermediate between the phenotypes of both homozygote parents (one of which is homozygous dominant, and the other of which is homozygous recessive). This intermediate phenotype is a demonstration of partial or incomplete dominance.

What happens to the phenotype of the heterozygotes when traits are inherited?

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With incomplete dominance, a heterozygous individual shows a blend of the parents' two traits. Neither allele (or gene) inherited completely dominates the other; instead, the two traits mix for a completely different phenotype in the offspring.

Is not observed in the heterozygote?

An allele whose phenotypic effect is not observed in a heterozygote - it is "masked" or hidden.

Has no noticeable effect on the phenotype of a gene when the individual is heterozygous for that gene?

If the two alleles of an inherited pair differ (the heterozygous condition), 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.

When an allele has no noticeable effect on an organism quizlet?

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.

When both alleles are expressed equally in the phenotype of the heterozygotes?

Codominance occurs when both alleles are expressed equally in the phenotype of the heterozygote. The red and white flower in the figure has codominant alleles for red petals and white petals. Codominance.

How does genotype determine phenotype quizlet?

How does the genotype of an organism determine its phenotype? By specifying what kinds of RNA and which structural, enzymatic, and regulatory protein molecules are produced. -Polypeptides determine phenotype by acting as structural, enzymatic, and regulatory proteins.

How does genotype determine phenotype?

The term "phenotype" refers to the observable physical properties of an organism; these include the organism's appearance, development, and behavior. An organism's phenotype is determined by its genotype, which is the set of genes the organism carries, as well as by environmental influences upon these genes.

What kind of allele determines the phenotype quizlet?

If the alleles differ, the dominant allele determines the organism's appearance, and the recessive allele has no noticeable effect.

When an allele has no noticeable effect on an organism the trait is?

“if the two alleles at a locus differ, then one, the dominant allele, determines the organism's appearance; the other, the recessive allele, has no noticeable effect on the organism's appearance.” (Text quoted from page 254 of the textbook) A dominant allele may be expressed when only one dominant allele is present.

How does incomplete dominance affect the phenotype of a heterozygote?

In incomplete dominance, the phenotype in a heterozygous individual is visibly less intense than that in an individual homozygous for the dominant allele, so that AA and Aa genotypes produce different phenotypes. Hence, the heterozygote (Aa) will have a phenotype intermediate between that of AA and aa individuals.

Which of the following do you expect if an individual is heterozygous for the sickle cell trait see Concept 14.3 page?

Which of the following do you expect if an individual is heterozygous for the sickle-cell trait? He or she will show some symptoms of the disease. - A heterozygote will produce both normal and abnormal hemoglobin. What is an allele?

What is the phenotype of a homozygous dominant individual?

Explanation: In a monohybrid (single trait) cross, there are three possible genotypes. The Phenotype is the possible trait displayed by the genotype. A homozygous dominant genotype is one in which there are two dominant alleles.

When the resulting heterozygotes exhibit the traits of both parents this pattern is called?

Incomplete dominance is the expression of two contrasting alleles such that the individual displays an intermediate phenotype. Codominance is a variation on incomplete dominance in which both alleles for the same characteristic are simultaneously expressed in the heterozygote.

Does selection against heterozygotes change allele frequency?

Because of the sheltering effect of heterozygotes, selection against recessive phenotypes changes the frequency of the recessive allele slowly.

Which allele is not expressed in a heterozygote?

An allele that is not expressed in the heterozygous condition is (d) recessive. Each variation of a gene sequence is an allele.

How does Overdominance affect allele frequencies?

Overdominance leads to stabilizing selection that maintains both alleles in a population. A) The allele frequency converges to an equilibrium value irrespective of the initial frequency.

How many different phenotypes are possible among the offspring?

Figure 13: The possible genotypes for each of the four phenotypes. Even though only four different phenotypes are possible from this cross, nine different genotypes are possible, as shown in Figure 13.

When traits are inherited in an incomplete dominance pattern What is true of the heterozygotes?

When traits are inherited in an incomplete dominance pattern, what is true of the phenotype of the heterozygotes? It is intermediate between those of the two homozygotes. In what type of inheritance are both alleles expressed equally? Traits controlled by more than two alleles are said to have multiple alleles.

Can a person's genotype be determined by their phenotype Why or why not?

No, a person's genotype cannot be determined solely by their phenotype as many genes in our genome do not get expressed.