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प्रश्न
What is back cross?
उत्तर
The back cross is a cross of an F1 hybrid with any one of the parental genotypes. The back cross is of two types; they are dominant back cross and recessive back cross. It involves the cross between the F1 off spring with either of the two parents.
संबंधित प्रश्न
State Mendel’s law of Independent Assortment.
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.
Multiple Choice Question
When two individuals differing in at least one character are crossed, the process is known as:
The genotype of a plant showing the dominant phenotype can be determined by
In a test cross involving F1 dihybrid flies, more parental type offspring were produced than the recombination type offspring. This indicates
Define Genetics.
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.
Mendel’s last law is ______.
The process of mating between closely related individuals is ______.
A fruit fly exhibiting both male and female traits is ______.
Mendel’s Law of independent assortment holds good for genes situated on the ______.
Two genes ‘A’ and ‘B’ are linked. In a dihybrid cross involving these two genes, the F1 heterozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation?
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.
Given below is a dihybrid cross performed on Drosophila.
Which of the following conclusions can be drawn on the basis of this cross? When yellow bodied (y), white-eyed (w) Drosophila females were hybridized with brown bodied (y+), red-eyed males (w+) and F1 progenies were intercrossed, F2 generation would have shown the following ratio:
Do genetic combination of mothers play a significant role in determining the sex of a new born?
Which one of the following genetic ratios will be obtained in a dihybrid test cross:
Which of the following statement is not correct for two genes that show 50% recombination frequency?
Mendel's law of independent assortment is based on F2 ratio of:
