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When two alleles are co-dominant to each other, it is called complementary factor. For example gene A & B are responsible to contribute red flower color. When present individually in dominant condition, only white flowers are produced. When both these genes combine, the result brings red flowers. Thus when such individuals with white color are crossed, all F1 plants produce red flowers but in F2 generation, the plants segregate in the phenotypic ratio of 9:7. That is 9 plants with red flowers and 7 plants with white flowers.
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In pea plants, individuals that are Pp for the alleles that code for flower color will have purple flowers. What is the phenotype?
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Pp, where P represents the dominant allele and p represents the recessive allele.
Nope! TT is the dominant phenotype (what ever it may be) and tt is the recessive phenotype (what ever that may be).So say T is the allele for Tall plants, t is the allele for short plants. TT would be show the tall phenotype while tt would show the short phenotype. If the genotype was Tt, the phenotype would be tall as well because the T is dominant and masks the phenotype of t (short plants).
An allele can effect the phenotype of an organism by its dominance or recessiveness. If two dominant alleles are crossed the offsprings will carry the dominant trait of the alleles. If a dominant allele is crossed with recessive allele the phenotype of the offsprings will be of that of the dominant allele. And if two recessive alleles are crossed the phenotype of their offsprings will carry the reccesive trait.
When two alleles are co-dominant to each other, it is called complementary factor. For example gene A & B are responsible to contribute red flower color. When present individually in dominant condition, only white flowers are produced. When both these genes combine, the result brings red flowers. Thus when such individuals with white color are crossed, all F1 plants produce red flowers but in F2 generation, the plants segregate in the phenotypic ratio of 9:7. That is 9 plants with red flowers and 7 plants with white flowers.
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In pea plants, individuals that are Pp for the alleles that code for flower color will have purple flowers. What is the phenotype?
Because Mendel crossed two pure-breeding plants. One being homozygous dominant and one being homozygous recessive. All of the progeny ended up being heterozygous, causing them to take on the dominant phenotype and look like the homozygous dominant parent.
The simplest way that two plants can have different genotypes, but the same phenotype, is if they both have a dominant allele for the same trait. For example, the genotypes Pp and PP, will both produce the phenotype created by P (for example, pink coloured petals). This is because P is dominant to p, and will always be expressed. Other ways that the same phenotype can be created from different genotypes are when the environment affects the traits, or when the trait is controlled by more than one gene.
No genes disappear in the F1 generation. Each of the F1 plants was heterozygous, having both a dominant and recessive alleles. The recessive phenotype disappears in the F1 generation because all members of that generation carry a dominant allele. In the F2 generation, the recessive phenotype will reappear.
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No genes disappear in the F1 generation. Each of the F1 plants was heterozygous, having both dominant and recessive alleles. The recessive phenotype disappears in the F1 generation because all members of that generation carry a dominant allele. In the F2 generation, the recessive phenotype will reappear.
If two homozygous plants with contrasting traits are crossed, the expected genotypes for the offspring will be heterozygous. The dominant trait would be expressed, but they'd be carriers for the recessive trait.