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Question
In Mendel’s experiments, tall pea plants (T) are dominant over dwarf pea plants (t).
What is a Dihybrid Cross?
Solution
Dihybrid cross is a cross between 2 different lines/genes that differ in two observed traits.
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RELATED QUESTIONS
Define the following:
Recessive
Predict the genotype and phenotype of the following cross in pea.
TTrr x ttRR
(Capital letters show dominance)
Why law of segregation is also called the law of purity of gametes?
9 : 3 : 3 : 1 ratio is due to ______
A typical Mendelian dihybrid ratio of F2 generation is 3:1.
______ pairs of contrasting characters in pea plants were studied by Mendel in his experiments.
It is said that Mendel proposed that the factor controlling any character is discrete and independent. This proposition was based on the ______.
Which of the following characters was not chosen by Mendel?
New species may be formed if
- DNA undergoes significant changes in germ cells
- chromosome number changes in the gamete
- there is no change in the genetic material
- mating does not take place
Mendel blended his knowledge of science and mathematics to keep count of the individuals exhibiting a particular trait in each generation. He observed a number of contrasting visible characters controlled in pea plants in a field. He conducted many experiments to arrive at the laws of inheritance.
- What do the F1 progeny of tall plants with round seeds and short plants with wrinkled seeds look like?
- Name the recessive traits in the above case.
- Mention the type of the new combinations of plants obtained in F2 progeny along with their ratio, if F1 progeny was allowed to self-pollinate.
OR
If 1600 plants were obtained in F2 progeny, write the number of plants having traits:
- Tall with round seeds.
- Short with wrinkled seeds.
Write the conclusion of the above experiment.
