Advertisements
Advertisements
Question
Give reasons for the appearance of new combinations of characters in the F2 progeny.
Solution
The reason for the appearance of new combinations in the F2 generation is the Law of Independent Assortment which states that when two pairs of traits are combined in a hybrid, one pair of character segregates independent of the other pair of character.
The two or more genes are inherited independent of each other and they recombine in the zygote to form new combinations in F2 generation. For example, when a tall pea plant with round seeds is crossed with a short pea plant with wrinkled seeds, the gene controlling plant height (tall/short) segregate independent of the gene controlling seed shape (round/wrinkled) and they recombine in the zygote to form new combinations (tall and wrinkled seeds and short and round seeds).
APPEARS IN
RELATED QUESTIONS
The F2 progeny of a monohybrid cross showed phenotypic and genotypic ratio as 1:2:1 unlike that the Mendel’s monohybrid F2 ratio. With the help of a suitable example, work out a cross and explain how it is possible.
Define the following:
Heterozygous
Choose the correct answer:
Mendel conducted his hybridization experiments on _______
Multiple Choice Question
What is the effect of sexual reproduction?
If Mendel had studied the seven traits using a plant with 12 chromosomes instead of 14, in what way would his interpretation have been different?
It is said that Mendel proposed that the factor controlling any character is discrete and independent. This proposition was based on the ______.
When two unrelated individuals or lines are crossed, the performance of F1 hybrid is often superior to both its parents. This phenomenon is called?
An organism with two identical alleles is
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.
Purity of gametes is linked to ______.
