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?

What is the pattern of inheritance for polygenic trait?

Match List I with List II :

Genes R and Y follow independent assortment. If RRYY produce round yellow seeds and rryy produce wrinkled green seeds, what will be the phenotypic ratio of the F₂ generation?

With the help of given pedigree, find out the probability for the birth of a child having no disease and being a carrier (has the disease mutation in one allele of the gene) in F₃ generation.

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

Match List I with List II :

As per ABO blood grouping system, the blood group of father is B⁺, mother is A⁺ and child is O⁺. Their respective genotype can be

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 :

Broad palm with single palm crease is visible in a person suffering from-

Which one of the following symbols represents mating between relatives in human pedigree analysis?

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?

If ‘8’ Drosophila in a laboratory population of ‘80’ died during a week, the death rate in the population is ______ individuals per Drosophila per week.

The recombination frequency between the genes a & c is 5%, b & c is 15 %, b & d is 9%, a & b is 20%, c & d is 24% and a & d is 29%. What will be the sequence of these genes on a linear chromosome?

If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness?

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?

Select the correct match.

How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?

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

Select the INCORRECT statement.

What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia, and is sterile?

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and F₁ generation pink flowers were obtained. When pink flowers were selfed, the F₂ generation showed white, red and pink flowers. Choose the INCORRECT statement from the following:

Select the INCORRECT statement.

Select the correct statement.

Select the correct match.

A woman has an X⁻linked condition on one of her X chromosomes. This chromosome can be inherited by

Which of the following characteristics represent ‘Inheritance of blood groups’ in humans? a. Dominance b. Co⁻dominance c. Multiple allele d. Incomplete dominance e. Polygenic inheritance

Which of the following pairs is wrongly matched?

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?

The genotypes of a Husband and Wife are IᴬIᴮ and Iᴬi. Among the blood types of their children, how many different genotypes and phenotypes are possible?

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

Which of the following most appropriately describes haemophilia?

A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F₁ plants were selfed the resulting genotypes were in the ratio of

In a test cross involving F₁ dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates

Pick out the correct statements: a. Haemophilia is a sex-linked recessive disease. b. Down’s syndrome is due to aneuploidy. c. Phenylketonuria is an autosomal recessive gene disorder. d. Sickle cell anaemia is an X⁻ linked recessive gene disorder.