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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
Dominant character masks the ______________ characters.
Give any four reasons for Mendel's success.
Select the most appropriate option
Which one of the following has the smallest number of chromosomes?
(a) Onion
(b) Mouse
(c) Monkey
(d) Ascaris
In Mendel’s experiments, tall pea plants (T) are dominant over dwarf pea plants (t).
What is the phenotypic ratio and genotypic ratio of the above cross in (ii)?
Distinguish between monohybrid and dihybrid cross.
Define the following:
Genotype
Predict the genotype and phenotype of the following cross in pea.
tt x TT
(Capital letters show dominance)
Explain the following term : Homozygous
Explain the following term : Pedigree chart
Multiple Choice Question
Who among the following is called father of genetics?
It is said that Mendel proposed that the factor controlling any character is discrete and independent. This proposition was based on the ______.
Genes which code for a pair of contrasting traits are known as ______.
If a round, green seeded pea plant (RRyy) is crossed with a wrinkled, yellow seeded pea plant (rrYY), the seeds produced in the F1 generation are ______.
To study the natural phenomenon of inheritance, Mendel selected pea plants. Which of the following properties were suitable for their studies?
(i) Plants would easily self-pollinate or cross-pollinate in nature.
(ii) Plants were easily grown in garden soil with a considerably shorter generation time.
(iii) Pea plants do not require true-breeding for hybridization experiments.
(iv) Many parts of the plant such as pod, seed, flower, cotyledons showed distinct phenotypes.
Read the following and answer from given below:
According to Mendel, one gene controls the expression of one character only. The ability of a gene to have multiple phenotypic effects because it influences a number of characters are an exception. The gene has multiple phenotypic effects because its ability to control two or more characters can be seen in cotton. In cotton, a gene for the lint also influences the height of the plant, size of the ball, number of ovules, and viability of seeds.
Which of the following statements is not correct regarding genes with multiple phenotypic effects?
Give reasons for the appearance of new combinations of characters in the F2 progeny.
The F1 generation has all tall, and F2 ratio 3 : 1, it proves:
Tall pea plants having green pods were crossed with dwarf pea plants having yellow pods. Out of 80 plants, how many are likely to be tall plants in the F2 generation?
