Biology

If a heterozygous tall plant is crossed with a homozygous dwarf plant, then the ratio of the dwarf plant is ____.

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If a heterozygous tall plant is crossed with a homozygous dwarf plant, then the ratio of the dwarf plant is 50%. In the cross Tt × tt, the offspring produced will be 50% tall (all Tt) and 50% dwarf (tt).

Morgan’s experimental material was ____.

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Morgan’s experimental material was Drosophila melanogaster.

Inbreeding is also called ____.

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Inbreeding is also called self fertilisation.

Which of the following statements is true?

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A pure tall plant can be differentiated from a hybrid tall plant by selfing and noticing that all progeny are tall is true. Noticing the height or recording it tells us only about the phenotype and not whether the plant is a pure tall (homozygous dominant) plant or not.

If the genes for controlling seed coat colour and height of the plant were present on the same chromosome very closely; then Mendel would not have been able to arrive at the phenomenon of ____ in a dihybrid cross.

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If the genes for controlling seed coat colour and height of the plant were present on the same chromosome very closely; then Mendel would not have been able to arrive at the phenomenon of independent assortment in a dihybrid cross. Independent assortment can take place only if two genes are present on separate chromosomes or if the genes are far apart on a chromosome.

The segregation of paired genes occurs during ____.

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The segregation of paired genes occurs during anaphase of first meiotic division.

____ is not a pair of contrasting characters.

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Round and constricted is not a pair of contrasting characters, The contrasting character for round is wrinkled. The contrasting character for constricted is inflated.

One of the contrasting forms of character is said to be a/an ____.

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One of the contrasting forms of character is said to be an allele.

Which of the following statements is true?

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The four daughter cells obtained after meiosis differ from each other due to both crossing over and independent assortment of chromosomes is the true statement.

XO type of sex chromosomes can be seen in ____.

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XO type of sex chromosomes can be seen in male grasshoppers. The females have XX sex chromosomes. Butterflies have XX males and XY females.

The appearance of a hidden character in some offspring in F2 generation obeys the law of ____.

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The appearance of a hidden character in some offspring in F2 generation obeys the law of segregation.

If the cell of an organism heterozygous for two genes represented by P and Q undergoes meiosis, then the possible genotypic combinations of the gametes will be ____.

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If the cell of an organism heterozygous for two genes represented by P and Q undergoes meiosis, then the possible genotypic combinations of the gametes will be PQ, pq, Pq and pQ. The genotype of the parent is PpQq. The gametes produced will be PQ, pq, Pq and pQ.

A test cross is done to find out ____.

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A test cross is done to find whether individuals exhibiting dominant character are homozygous or heterozygous.

The males of Drosophila have ____ chromosomes.

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The males of Drosophila have XY chromosomes. The females have XX chromosomes.

____ can be used to study incomplete dominance.

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Flower colour in Antirrhinum can be used to study incomplete dominance.

____ gave the chromosome theory of inheritance.

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Sutton and Boveri gave the chromosome theory of inheritance.

The ratio of genotype 1: 2: 1 in the offspring in F2 indicates that ____.

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both F1 parents are heterozygous.

Mendel’s factors are now known as ____.

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Mendel’s factors are now known as genes.

The genotypes of the tall plants in the F2 in Mendel's cross was ____.

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The genotypes of tall plants in the F2 in Mendel's cross was TT and Tt.

A test cross is a cross between ____.

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A test cross is a cross between a heterozygous F1 hybrid and double recessive homozygous parent.

Independent assortment means ____.

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Independent assortment means separation of parental characters.

Which one of the following statements is true?

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Recessive trait can only be expressed in homozygous condition is the true statement. Dominant trait can be expressed in both homozygous and heterozygous conditions. Recessive character cannot be expressed in heterozygous condition.

On inbreeding, the homozygous parents plants will produce ____.

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On inbreeding, the homozygous parent plants will produce all similar offspring. Homozygous plants have both the alleles of the same type and hence the offspring produced will of the same type.

Independent assortment can be proved by carrying out a _____.

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Independent assortment can be proved by carrying out a dihybrid cross

ZW method of sex determination is seen in ____.

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ZW method of sex determination is seen in birds.

In Antirrhinum, when a cross is made between plant having white and another plant having red flowers, all resultant flowers are ____.

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In Antirrhinum, when a cross is made between plant having white and another plant having red flowers, all resultant flowers are pink due to incomplete dominance.

On the basis of independent assortment and the physical basis of inheritance, ____ assort independently during gamete formation.

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On the basis of independent assortment and the physical basis of inheritance, homologous chromosomes assort independently during gamete formation.

In Pisum sativum, terminal flowers are a ____ character.

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In Pisum sativum, terminal flowers are a recessive character.

Which of the following statements is correct?

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The correct statement is that in incomplete dominance the phenotypic ratio and the genotypic ratio’s are same. Both the genotypic and the genotypic ratios are equal to 1: 2: 1.

The phenotypic ratio of 1: 2: 1 in the offspring explains the principle of ____.

Correct! Wrong!

The phenotypic ratio of 1: 2: 1 in the offspring explains the principle of incomplete dominance only. In incomplete dominance a heterozygous condition results in the formation of an intermediate phenotype. Hence, three phenotypes are produced leading to a ratio of 1: 2: 1.

ICSE Class 10th Biology 2 - Genetics MCQs
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