MCQs of Biology – Monohybrid Cross

When a cross is made between two parents with respect to a single character, it is called :

Mendel formulated the law of purity of gametes on the basis of:

Law of dominance- recessivencess is proved by:

Monohybrid cross involves individuals:

Which of the following is the monohybrid ratio:

When a tall pea plant )TT) is crossed with a dwarf plant (tt) , what will be the F2 generation?

A monohybrid cross produced tall and dwarf plants in the ratio 3:1. The genotype of the hybrids can be:

In a cross 45 tall and 14 dwarf plants were obtained .Genotypes of parents are:

In a monohybrid cross, the genotypic ratio of F2 is:

In all of Mendel’s experiments, the two alleles causing a trait were:

If two alleles come together, only one is able to express self. This is called:

The character which appears at F1 generation is:

A gene is said to dominant if:

Pure tall plants are crossed with pure dwarf plants. In the f1, generation all plants were tall. These tall plants of F1 generation were self ed and the ratio of tall to dwarf plant obtained was 3:1 . This is called:

Two crosses between the same pair of genotypes o phenotypes in which the sources of the gametes are reversed in one cross, is known as:

Pure red – flowered and white – flowered plants were crossed. It produced 120 offspring with:

A homozygous plant with red flower is crossed with recessive white.Red is dominant over white. The progeny in the F1 generation will be:

How many types of gametes will be produced in F2 generation of a monohybrid cross of Mendel?

Considering tallness and dwarfness, tallness is more widespread among pea plants because:

A red- flowered pea plant was crossed with white- flowered plant. In f1 generation all plants were red. It confirms that white col lour is:

One of Mendel’s pure strains of pea plants had white flowers. How many different kinds of eggs could such a plant produce with regard to flower colour?

A woman with straight hair mates with a man with curly hair who is known to be heterozygous for that trait. What is the chance that their first child will have curly hair?

Percentage of heterozygous individuals obtained from selfing Rr individuals is:

If the frequency of a recessive phenotype in a stable population is 25% the frequency of recessive allele in the population would be:

Black coat of guinea pigs is a dominant trait: white is the recessive trait. When a pure black guinea pig is crossed to a white one, what fraction of the black f2 is expected to be heterozygous?

Which statement about Mendel’s cross of RR peas with rr peas is not true?

A heterozygous round seeded (Rr) plant is crossed to recessive wrinkled (rr) seeded plant. The progeny would be:

A pure tall and a pure dwarf plant were crossed to produce offspring’s. Offspring were self- crossed, then find out the ratio between true breeding tall to true breeding dwarf?

In human being, brown eye (B) is dominant over blue eye (b). A brown- eyed couple has a blue- eyed child. What is the possible genotypes of the couple :

Which of the following crosses and resultant phenotypic ratios are mismatched?

Mendel’s law of independent assortment is applicable for:

IN humans, freckles are dominant over no freckles. A man with freckles marries a woman having freckles, but the children have no freckles,. What chances did each child have for freckles?

In fruit flies, L= long wings and /= short wings. The offsprings exhibit a 1:1 ratio when a long- winged fly is crossed with short – winged fly> What is thegenotype of par antes?

In the garden pea, round seeds are dominant over wrinkled seeds. An investigator crosses a plant having round seeds with a plant having wrinkled seeds. He counts 400 offspring. How many of the offspring have wrinkled seeds if the plant having round seeds is a heterozygote?

In human, pointed eyebrows (B) are dominant over smooth eyebrows (b) sara’s father has pointed eyebrows, but she and her mother have smooth. What is the genotype of the father?

IN peas, yellow seed (Y) is dominant over green seed (y) . In the F2 generation of a monohybrid cross that begins when a dominant homzygote is crossed with a recessive homozygote, you would expect:

A tobacco plant heterozygous for albinism ( a recessive character ) is self- pollinated and 1200 seeds are subsequently germinated. How many seedlings would have parental genotype?

if a cross is made between AA and aa, the nature of F1 progeny will be:

Ratio of progeny when a red coloured heterozygote is crossed with a white coloured plant in which red colour in dominant to white colour:

Two pea plants were subjected cross pollination. Of the 183 plants produced in the next generation 94 plants were found to be tall and 89 plants were found to be dwarf. The genotypes of the two parental plants are likely to be:

Chi – square test is:

Segregation of Mendelian factors ( no linkage no crossing over) occurs during :