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प्रश्न
Using a Punnett square, work out the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus.
उत्तर
When a heterozygous male tall plant (Tt) crosses with a homozygous dominant female tall plant (TT), we receive two types of gametes in males: half with T and half with t, while females only get one form of gamete, T.
The Punnett square shows that all of the progeny in the F1 generation are tall (Tt), with 50% homozygous tall (TT) and 50% heterozygous tall (Tt).
APPEARS IN
संबंधित प्रश्न
Give appropriate biological/technical terms for the following:
A pair of corresponding chromosomes of the same size and shape, one from each parent.
In a homozygous pea plant, axial flowers (A) are dominant over terminal flowers (a).
(i) What is the phenotype and genotype of the F1 generation if a plant bearing pure axial flowers is crossed with a plant bearing pure terminal flowers?
(ii) Draw a Punnett square board to show the gametes and offsprings when both the parent plants are heterozygous for axial flowers.
(iii) What is the phenotypic ratio and genotypic ratio of the above cross shown in (ii)?
(iv) State Mendel’s Law of Dominance.
(v) Name two genetic disorders commonly seen in human males.
The cross between two parents having one pair of contrasting characters
Explain the following terms:
Laws of Inheritance
Choose the correct answer:
Mendel conducted his hybridization experiments on _______
Choose the correct answer:
If a homozygous tall plant is crossed with a heterozygous tall plant, the proportion of tall progeny would be ____________
Choose the correct answer:
Father of genetics ________
Choose the correct answer:
If a pea plant with round seeds is selfed and the offspring are in the ratio 3:1, then the plant is _________
Explain the statement of Law of dominance is not universal.
The colour based contrasting traits in seven contrasting pairs, studied by Mendel in pea plant were ______.
What is the probability of production of dwarf offsprings in a cross between two heterozygous tall pea plants?
Which of the following are reasons for Mendel’s success?
- Usage of pure lines or pure breeding varieties
- Consideration of one character at a time
- Maintenance of statistical records of experiments
- Knowledge of linkage and incomplete dominance
The material used for conducting experiments on genetic traits by Mendel was ______.
Which is the one characteristic of the parents that can be inherited by their children?
In his cleric experiments on pea plants, Mendel did not use:
The F1 generation has all tall, and F2 ratio 3 : 1, it proves:
Test Cross is a cross between:
Mendel was the first biologist to ______
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.
