Tag: mendel's laws

Questions Related to mendel's laws

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

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  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?

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  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.

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  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 _____________

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  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?

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  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?

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  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?

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  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