NEET Botany Principles Of Inheritance And Variation Class 12 Questions

Which is the dominant trait

In case of codominance:

Which one of the following conditions correctly describes the manner of determining the sex in the given example?

Match List I with List II:

Which one of the following disorders is caused by the substitution of Glutamic acid (Glu) by Valine (Val) at the sixth position of the beta globin chain of the haemoglobin molecule?

In a population of a grasshopper species, the chromosome number of some members is 23 and some other members possess 24 chromosomes. The 23 and 24 chromosome-bearing members in this species are ________.

What is the pattern of inheritance for polygenic trait?

Match List I with List II :

Which one of the following can be explained on the basis of Mendel’s Law of Dominance? A. Out of one pair of factors one is dominant and the other is recessive. B. Alleles do not show any expression and both the characters appear as such in F₂ generation. C. Factors occur in pairs in normal diploid plants. D. The discrete unit controlling a particular character is called factor. E. The expression of only one of the parental characters is found in a monohybrid cross. Choose the correct answer from the options given below:

A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?

In a plant, black seed color (BB/Bb) is dominant over white seed color (bb). In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it?

Match List I with List II

Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by

The phenomenon of pleiotropism refers to

Which of the following statements are correct about Klinefelter’s Syndrome? A. This disorder was first described by Langdon Down (1866). B. Such an individual has overall masculine development. However, the feminine development is also expressed. C. The affected individual is short statured. D. Physical, psychomotor and mental development is retarded. E. Such individuals are sterile. Choose the correct answer from the options given below :

XO type of sex determination can be found in:

Given below are two statements: Statement I: Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inheritance. Statement II: Seven characters examined by Mendel in his experiment on pea plants were seed shape and colour, flower colour, pod shape and colour, flower position and stem height. In the light of the above statements, choose the correct answer from the options given below:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Mendel’s law of Independent assortment does not hold good for the genes that are located closely on the same chromosome. Reason (R) : Closely located genes assort independently. In the light of the above statements, choose the correct answer from the options given below:

Which of the following occurs due to the presence of autosome linked dominant trait?

The production of gametes by the parents, formation of zygotes, the F₁ and F₂ plants, can be understood from a diagram called:

The fruit fly has 8 chromosomes (2n) in each cell. During interphase of Mitosis if the number of chromosomes at G₁ phase is 8, what would be the number of chromosomes after S phase?

In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?

What map unit (Centimorgan) is adopted in the construction of genetic maps?

Select the INCORRECT statement.

Select the correct statement.

Select the correct match.

A disease caused by an autosomal primary non-disjunction is

Homozygous pure lines in cattle can be obtained by

Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.

Among the following characters, which one was not considered by Mendel in his experiments on pea?

Match the term in Column I with their description in Column II and choose the correct option.

Which is the most common mechanism of genetic variation in the population of sexually reproducing organism?

A man with blood group ‘A’ marries a woman with blood group ‘B’. What are all the possible blood groups of their offsprings?

How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?

Multiple alleles are present

The movement of a gene from one linkage group to another is called

A human female with Turner’s syndrome

A man whose father was colour blind marries a woman who had a colour blind mother and normal father. What percentage of male children of this couple will be colour blind?

Down's syndrome in humans is due to: