Tag: mendel's law of inheritance

Questions Related to mendel's law of inheritance

Assume that flower colour is controlled by a single gene. In a given plant, red flower colour is dominant over white flower colour. Two red flower bearing plants were crossed and the progeny consists of 45 plants bearing red flowers and 4 plants bearing white flowers this indicates that

mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

  1. Both the parents are heterozygous for the gene controlling flower colour

  2. One parent is true breeding for red flowers on the other heterozygous

  3. A mutation must have occurred in the progeny which (mutation) caused the appearance of white flowers

  4. The results are not consistent with the expected ratio 3 Red : 1 White. Hence both the parents cannot be heterozygous

Show answer
Correct Option: C
Explanation:

Ratio is totally deviated from 3(red) : 1 (white), Hence this is a case of mutation which is resulting into this outcome.

Mendel's law of segregation states that?

mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

  1. The alleles do not show any blending and that both the characters are recovered as such in $F _2$ generation

  2. The factors or alleles of a pair segregate from each other such that a gamete receives only one of the two factors

  3. Homozygous parent produces all gametes that are similar while heterozygous produces two kinds of gametes each having one allele with equal proportion

  4. All of the above

Show answer
Correct Option: A

Find which options are correct. According to Mendel's law of purity of gametes.
A) In $F1$ hybrid, the dominant and recessive character though remain together for long time but do not contaminate or mixed with each other.
B) The inheritance of one character is always independent to the inheritance of other character within the same individual.
C) The gamete formed contains the factors, which determines single trait pertaining to a particular character.
D) Two genes of allelomorphic pair are not related as dominant or recessive but each of them expresses itself partly.

mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

  1. A, B and C are correct

  2. A and B are correct

  3. B and D are correct

  4. A and C are correct

Show answer
Correct Option: A

Independent segregation of genes is seen in case of _____________

mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

  1. Law of dominance

  2. Law of segregation

  3. Law of independent assortment

  4. Both (A) and (C)

Show answer
Correct Option: C
Explanation:

Genes for different traits can segregate independently during the formation of gametes. This is the result of Law of independent assortment which was studied Mendel. Therefore, (C) is the correct answer.

Each gamete carries only one allele. This is proposed in which law?

mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

  1. Law of dominance

  2. Law of segregation

  3. Law of independent assortment

  4. None of the above

Show answer
Correct Option: B
Explanation:

During gamete formation, the alleles for each gene segregate from each other so that each gamete carries only one allele for each gene. This was proposed in the Law of segregation. Therefore, (b) is the correct answer.

Which of the following follows Mendel's law of segregation?

mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

  1. Genetic material is equally distributed during mitosis.

  2. Each gamete receives one gene for an allele.

  3. Genetic material enters only one gamete.

  4. All of the above.

Show answer
Correct Option: B
Explanation:

Mendel's law of Segregation: The principle of segregation describes how pairs of gene variants are separated into reproductive cells. The segregation of gene variants, called alleles, and their corresponding traits was first observed by Gregor Mendel in 1865. Mendel was studying genetics by performing mating crosses in pea plants.
Each gamete receives one gene for an allele and thus, is haploid in nature. Both male and female gametes, which are haploid will fuse and forms a diploid zygote.

So, the correct answer is 'Each gamete receives one gene for an allele.'

How was Mendel's work ultimately reconciled with Darwin's theory of natural selection during the evolutionary synthesis in the 1930s and 1940s?

mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

  1. Scientists recognized that once one thinks about species as populations, rather than individuals, there is no incompatibility between them.

  2. Mendel's theory was replaced by the mutation theory.

  3. It was recognized much of the variation we observe in nature is due to recombination, rather than mutation.

  4. a and c.

Show answer
Correct Option: D

Choose the correct answer from the alternatives given.


A couple has six daughters, What is the possibility of their having a girl next time?

biology mendel's law of inheritance determination of sex sex determination sex determination in humans

  1. 10%

  2. 50%

  3. 90%

  4. 100%

Show answer
Correct Option: B
Explanation:

The possibility of having a girl or boy child is equal Le., 50% as 50% male gametes are Y type and 50% are X type. Fusion of egg with X type sperm will produce a girl child. 

If the first seven children born to a particular pair of parents are all males, what is the probability that the eighth child will also be a male?

biology mendel's law of inheritance determination of sex sex determination sex determination in humans

  1. $\dfrac{1}{2}$

  2. $\dfrac{1}{4}$

  3. $\dfrac{1}{8}$

  4. $\dfrac{1}{16}$

Show answer
Correct Option: A
Explanation:
The sex of an individual depends on the combination of sex chromosomes in its cells, that is, the combination of X and Y chromosomes. An embryo with XX genotype would develop into a female, while an embryo with an XY would develop into a male. The mother has a genotype and would always produce gametes with an X chromosome. The father, however, would produce half the gametes having an X chromosome and half carrying a Y chromosome. The sex of the embryo in humans would hence depend on the chromosome present in the gamete of the father. For every child conceived, there is an equal probability of the child being a male or a female, as the gamete received from the father has a 50% chance of carrying an X chromosome and  50% chance of carrying a Y chromosome.
So, the correct answer is $\dfrac{1}{2}$

In human beings, the gametes from the .......... decides the sex of the baby.

biology mendel's law of inheritance determination of sex sex determination sex determination in humans

  1. Male parent

  2. Female parent

  3. Both A and B

  4. None of the above

Show answer
Correct Option: A
Explanation:
Sex is determined by two chromosomes, X and Y. A female is XX, a male is XY. Since women completely lack the Y chromosome, they always contribute an X chromosome to the baby. The sex is determined by whether the sperm that fertilizes the egg is carrying another X or a Y.
The generally accepted theory is that males determine the sex because males can donate both an X chromosome or Y chromosome, while females can only donate an X chromosome to their offspring, making their contribution constant and the male's contribution the variable which, under normal circumstances, determines the offspring's genetic sex.