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For a recessive trait to be expressed in a generation of offspring an individual must be a?
Homozygous
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When is a recessive allel expressed in offspring?
A recessive phenotype is expressed in an offspring that has a homozygous recessive genotype for that trait.
What type of alleles are expressed only if two identical copies exist on the homologs of the offspring?
Recessive alleles are expressed only when two identical copies exist on the homologs of the offspring. In this case, if an individual inherits two copies of the recessive allele, it will show the recessive trait.
In crossing a homozygous recessive with a heterozygote what is the chance of getting a homozygous recessive phenotype in the F1 generation?
1/2 or 50%. The homozygous recessive gentoype contains two recessive alleles for the gene for a trait. So the homozygous recessive individual can pass on only recessive alleles to an offspring. The heterozygous individual has one dominant and one recessive allele for the gene for a trait. So the heterozygous individual can pass on either a dominant or a recessive allele to an offspring. So if an offspring inherits a recessive allele from the heterozygous parent, along with the recessive allele from the homozygous recessive parent, it will have the homozygous recessive genotype and phenotype.
Which is expressed a dominant or recessive allele and which is passed on to the offspring?
A dominant allele is expressed when an individual carries one or two copies of that allele. A recessive allele is only expressed when an individual carries two copies of that allele. Dominant alleles are typically passed on to offspring if at least one parent carries the dominant allele.
Traits that typically will only be expressed in offspring if they inherit two copies of the genes for that trait is called what?
Recessive traits. This means that the trait is only expressed when an individual inherits two copies of the recessive allele for that trait, one from each parent.
What type of allele is known for skipping a generation?
Recessive alleles are known for skipping a generation. This is because the phenotype associated with a recessive allele is only expressed when an individual inherits two copies of the recessive allele, one from each parent. If one parent carries the allele but does not exhibit the trait, it can appear to "skip" a generation before being expressed.
What did Gregor Mendel call the traits that disappear in the first generation?
Gregor Mendel called the traits that disappear in the first generation recessive traits. These traits are not expressed in the offspring when there is a dominant trait present.
In which generation were recessive traits visible in a few plants in Mendel and experiments?
In Mendel's experiments, recessive traits became visible in the F2 generation. Initially, in the F1 generation, only dominant traits were expressed, but when the F1 plants were self-fertilized, the recessive traits reappeared in approximately 25% of the offspring in the F2 generation. This observation led Mendel to formulate his principles of inheritance.
Is it true that recessive alleles are never present when dominant alleles are present?
No, recessive alleles can still be present in an individual's genetic makeup even when dominant alleles are present. In this case, the recessive allele may not be expressed phenotypically, but can still be passed on to offspring.
What is the likelihood of a recessive trait being expressed if your offspring is crossed with a homozygous dominant eye shape prove your answer in a cross?
If you cross a homozygous dominant individual (AA) with a heterozygous individual (Aa), the offspring will have a genotype ratio of 100% dominant phenotype (AA or Aa) and 0% recessive phenotype (aa). Therefore, if your offspring has a homozygous dominant trait (AA), the likelihood of expressing a recessive trait (aa) is 0%. The Punnett square for this cross would show all dominant traits, confirming that recessive traits cannot be expressed in this scenario.
What happens to the recessive allele in a heterozygous offspring?
In a heterozygous offspring, the recessive allele is present but not expressed because the dominant allele masks its effects.
A trait that appears or is expressed in the f1 generation is what?
A trait that appears or is expressed in the F1 generation is considered dominant. Dominant traits will manifest themselves in the offspring when at least one parent carries the dominant allele for that trait.
