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Why are genotype fractions different from phenotype fractions of the same cross?
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How do you identify the genotype?
normal sexual cross pollination - each parent plant contributes traits from its genotype (which are expressed as the phenotype)
What would be the phenotype ratio and genotype ratio in the offesprings in the f2 generation?
For monohybrid cross the genotype ratio in f2 generation would be 1:2:1 and phenotype ratio would be 3: 1
Crossing over causes the offsprings to be different from the parent?
Chromosomal cross-over is what causes the offspring to be different from the parent. The chromosomal cross-over process occurs during meiosis I.
If R is dominant to r the offspring of the cross of RR with rr will be homozygous?
R R r Rr Rr r Rr Rr That is the Punnet Square. The genotype will be 100% Rr in the cross. The phenotype will be whatever phenotype is constituted by your dominant allele.
What kind of phenotype ratio would you expect from a mono-hybrid cross?
possible mendelian ratios for monohybrid cross genotype is 1:2:1 and phenotype is 3:1
How can the unknown genotype of an individual with a dominate phenotype be determined?
A test cross.
How do you identify the genotype?
normal sexual cross pollination - each parent plant contributes traits from its genotype (which are expressed as the phenotype)
What would be the phenotype ratio and genotype ratio in the offesprings in the f2 generation?
For monohybrid cross the genotype ratio in f2 generation would be 1:2:1 and phenotype ratio would be 3: 1
To perform a testcross scientists cross an organism with an unknown genotype with a organism.?
If an individual is of the dominant phenotype, its genotype can be either AA or Aa (letter A picked for demonstration's sake). To do a good test cross, we have to be able to unambiguously tell which one of the genotypes the individual is. The best test cross would be conducted with a homozygous recessive (aa) individual. This way, if the cross generates 100% dominant phenotype, then the original individual was homozygous dominant. If the cross generates 50% dominant and 50% recessive phenotype, then the original individual was heterozygous.
How can a test cross reveal the genotype of a parent whose phenotype is dominant?
Try using a Punnett Square.
To determine the genotype of an individual that shows the dominant phenotype you would cross the individual with one that is?
Homozygous recessive.
Is it possible to determine the genotype of a plant with a dominant phenotype the trait?
NO, because a dominant phenotype could either be homozygous or a heterozygous.so unless you are sure about the genotype of parents we can't determine it...but we can determine the genotype of a person showing reccessive phenotype, as a recessive trait always expresses itself in a homozygous condition..Read more: Is_it_possible_to_determine_the_genotype_of_a_person_showing_a_dominant_phenotype
What is a testcross?
Gregor Mendel devised the fundamental tool of the test cross. It is an experimental cross of an individual organism of dominant phenotype but unknown genotype and an organism with a homozygous recessive genotype .
To determine the genotype of an individual that shows the dominant phenotype you would cross that individual with one that is?
To determine the genotype of an individual that shows the dominant phenotype you would cross that individual with one that is homozygous recessive. A monohybrid cross of two individuals that are heterozygous for a trait exhibiting complete dominance would probably result in a phenotype ratio is 3 dominant 1 recessive.
What is the expected phenotype ratio of seed color of the offspring of an F1 x F1 cross?
If the parents were AA and AA for example then the phenotype ratio will be 1 A (the dominant allele). The genotype will be 1Aa.
Crossing over causes the offsprings to be different from the parent?
Chromosomal cross-over is what causes the offspring to be different from the parent. The chromosomal cross-over process occurs during meiosis I.
How do you make a single-factor cross?
1. Assign symbols (letters) 2. Indicate genotype of parents 3. How many different gametes 4. Punnet square 5. Determine phenotype
