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प्रश्न
Two heterozygous parents are crossed. If the two loci are linked what would be the distribution of phenotypic features in F1 generation for a dihybrid cross?
उत्तर
Linkage is defined as the coexistence of two or more genes in the same chromosome. If the genes are situated on the same chromosome and lie close to each other, then they are inherited together and are said to be linked genes.
For example, a cross between yellow body and white eyes and wild type parent in a Drosophila will produce wild type and yellow white progenies. It is because yellow bodied and white eyed genes are linked. Therefore, they are inherited together in progenies.
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संबंधित प्रश्न
What is a dihybrid cross? How did Mendel perform this cross?
A homozygous Tall plant (T) bearing red coloured (R) flowers is crossed with a homozygous dwarf plant (t) bearing white flowers (r):
(1) Give the Genotype and Phenotype of the F2 generation.
(2) Give the possible combinations of the gametes that can be obtained from the F2 hybrid.
(3) Give the dihybrid ratio and the phenotype of the offsprings of the F2 generation when two plants of the F1 generation above are crossed.
Give Technical Term:
The ratio of offspring on F2 generation in a dihybrid cross.
Complete the following sentence with appropriate word:
A character that is suppressed is _________.
Under which conditions does the law of independent assortment hold good and why?
In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seed pant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in the F1 generation?
Select the correct statement from the ones given below with respect to dihydrid cross
Which Mendelian idea is depicted by a cross in which the F1 generation resembles both the parents
In a test cross involving F1 dihybrid flies, more parental type offspring were produced than the recombination type offspring. This indicates
Name the seven contrasting traits of Mendel.
What is back cross?
What are the reasons for Mendel’s successes in his breeding experiment?
Identify the statementls that is/are NOT the correct reason/s for Mendel's success in his hybridization experiments.
i. Each factor controlled the single trait and is located on separate chromosomes.
ii. In the pea plant, contrasting characters can be easily recognized.
iii. Mendel carefully recorded the number of plants of each type and expressed his results as ratios.
iv. Mendel performed biochemical assays for identifying the position of 'factors' on chromosome.
Findings of Gregor Mendel were rediscovered by the following scientists EXCEPT for ______
A cross between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents?
In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that ______.
In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates ______.
Two linked genes a and b show 20% recombination. The individuals of a dihybrid cross between ++ /++ × ab/ab shall show gametes ______.
A dihybrid condition is ______.
The process of mating between closely related individuals is ______.
A fruit fly exhibiting both male and female traits is ______.
In a dihybrid cross AABB x aabb, F2 progeny of AABB, AABb, AaBB and AaBb occurs in the ratio of ______.
In the F2 generation of a Mendelian dihybrid cross the number of phenotypes and genotypes are ______.
Each gamete carry ______.
Assertion: When the two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combinations is much higher than the nonparental type.
Reason: Higher parental gene combinations can be attributed to crossing over between two genes.
What is the difference between genetic drift and change due to natural selection?
According to the evolutionary theory, formation of a new species is generally due to
How is the sex of a newborn determined in humans?
Sahil performed an experiment to study the inheritance pattern of genes. He crossed tall pea plants (TT) with short pea plants (tt) and obtained all tall plants in F1 generation.
When F1 plants were self-pollinated, a total of 800 plants were produced. How many of these would be tall, medium height or short plants? Give the genotype of F2 generation.
Which one of the following genetic ratios will be obtained in a dihybrid test cross:
When two hybrids rrTt and Rrtt are gassed, the phenotype ratio of offspring should be:
In the Mendelian dihybrid cross when heterozygous round yellow is self grossed, round green offsprings are represented by the genotype.
The ratio of 9 : 3 : 3 : 1 is due to:
Describe the dihybrid cross upto F2 generation as conducted by Gregor Mendel using pure lines of Garden Pea for characters-seed shape and seed colour.
