The Punnett Tool

Q. The phenotypic and genotypic ratios of the $F_2$ generation are similar in which of the following cases?

1. Incomplete dominance
2. Mendelian monohybrid cross
3. Mendelian dihybrid cross
4. All of the above

Q. What do you think Mendel would have got had he self-pollinated a tall F2 plant?

Q.

Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be:

1. Double fertilisation

2. Self pollination

3. Cross pollination

4. No fertilisation

Q. A pea plant heterozygous for violet flowers can produce offspring with white flowers if it is crossed with a

1. pea plant bearing violet flowers only
2. pea plant bearing white flowers only
3. pea plant bearing pink flowers only
4. pea plant bearing violet flowers or a pea plant bearing white flowers

Q. Haemophilic man marries a normal woman. Their offspring will be

1. all haemophilic
2. all boys haemophilic
3. all girls haemophilic
4. all girls are carriers

Q.

Which of the following will not result in variations among siblings?

1. Crossing over

2. Independent assortment of genes

3. Mutation

4. Linkage

Q. In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTT genotype is crossed with a plant that is rrtt. Then

1. 25% will be tall with red fruit
2. 50% will be tall with red fruit
3. 75% will be tall with red fruit
4. All of the offspring will be tall with red fruits

Q. In a cross between red-flowered (RR) and white-flowered (rr) plants of snapdragon, the $F_1$ plants were all pink-flowered.
What is the genotype of the $F_1$ and the reason for this phenotype?

1. Rr; Co-dominance
2. rr; Multiple alleles
3. rr; Co-dominance
4. Rr; Incomplete dominance

Q. Which cross yields red, white, and pink variety of dog flower?

1. RR $\times$ Rr
2. Rr $\times$ Rr
3. Rr $\times$ RR
4. Rr $\times$ rr

Q. A pea plant bearing violet flowers, pure line for the trait, was crossed with another plant bearing white flowers. The $F_1$ progeny was self-crossed. If 200 plants are produced in $F_2$ generation, predict the number of plants under each category mentioned:
i. Dominant
ii. Recessive
iii. Homozygous dominant

1. i-50, ii-100, iii-50
2. i-150, ii-50, iii-50
3. i-100, ii-50, iii-50
4. i-50, ii-50, iii-100

Q. Pseudoalleles (Lewis, 1951) are duplicate factors and are

1. two closely linked genes situated at adjacent but different loci affecting the same trait and hardly separated by crossing over
2. forms of same allele
3. mutation in different genes producing alleles with same effect
4. two alleles on same loci with same effect

Q. The production of gametes by the parents, formation of zygotes, the F₁ and F₂ plants, can be understood from a diagram called:

1. Net square
2. Bullet square
3. Punch square
4. Punnet square

Q.

What is the difference between recombinants and non-recombinants?

Q. What are the chances of a couple, heterozygous for the gene coding for albinism to have a fifth albino child?

1. 1 in 1
2. 1 in 2
3. 1 in 3
4. 1 in 4

Q. A trihybrid ratio of 27 : 9 : 9 : 9 : 3 : 3 : 3 : 1 is obtained because of

1. multiple alleles
2. interaction of genes
3. multiple factor inheritance
4. independent assortment of genes

Q.

On crossing red and white flowered plants, the ratio of red and white flowered plants in F₂ generation was 60:20, then on selfing the heterozygous red flowered plants, the ratio of offsprings would be?

Q. If a pea plant producing yellow seeds (Yy) is crossed with a plant producing green seeds (yy), what ratio of plants producing yellow and green seeds would you expect in $F_1$ generation?

1. 1 : 1
2. 9 : 1
3. 1 : 3
4. 3 : 1

Q. Nissl's granules are found in:

1. Liver cells
2. Nerve cells
3. Kidney
4. Heart

Q. Which of the following is/are correct regarding Punnett square?
A. The possible gametes are written on the left column and bottom row.
B. It helps determine the number of genes controlling a given trait.
C. The possible gametes are written on the left column and top row.
D. It helps predict the outcome of a genetic cross.

1. A, B
2. A, D
3. C, D
4. B, D

Q. In a particular plant, two genes control leaf shape and fruit color. Round leaves (R) are dominant to jagged leaves (r). Yellow fruits (Y) are dominant to white fruits (y). A true-breeding round-leaved, yellow-fruited plant is crossed with a jagged-leaved, white-fruited plant. What are the genotypes of the parent plants involved in this cross?

1. RRYY x RRYY
2. RRYY x rryy
3. RrYy x RrYy
4. RrYy x rryy

Q. When a tall and red flowered (both dominant) individual was crossed with a dwarf and white flowered individual, phenotype in the progeny was dwarf and white. What will be the genotype of tall and red flowered individual?

1. TTRr
2. TTRR
3. TtRR
4. TtRr

Q. How can you prove that a gene is dominant or recessive? Explain with examples.

Q. An $F_1$ generation plant produces flowers in which red and white petals are found in the same flower. One of the parents of this plant produced red flowers and the other parent produced white flowers. This is an example of which of the following forms of inheritance?

1. Co-dominance
2. Incomplete dominance
3. Dihybrid cross
4. Dominance

Q.

Select the correctly paired one

1. Monohybrid test cross phenotypic ratio: 1:1
2. Dihybrid cross $F_2$ genotype - 1:2:1:2:2:2:1:2:1

3. Monohybrid cross phenotypic ratio - 1:2:1

4. Monohybrid cross genotypic ratio - 3:1

Q. A breeding experiment was conducted in pea plant wherein the tallness of a plant was being studied. A pure tall plant was first taken as a male plant and then as the female plant in the second cross. The other plant in both the cases was a pure dwarf plant. The purpose of this experiment was primarily to find out

1. which was the dominant trait and which was the recessive trait
2. which allele is able to express itself in the heterozygous state
3. the role of parental sex on a given inheritance pattern
4. the reason of appearance of recessive character in F${}_2$ generation

Q.

In which of the inheritance patterns, both phenotypic ratio and genotypic ratio of the $F_2$ are identical?

1. Incomplete dominace
2. Mendelian dihybrid cross
3. Mendelian monohybrid cross
4. All of the above

Q. A cross between two homozygous individuals differing in two characters is called

1. monohybrid cross
2. dihybrid cross
3. test cross
4. reciprocal cross

Q. Back cross is

1. $F_1\times$ Any parent
2. $F_1\times$ Recessive parent
3. $F_1\times$ Dominant parent
4. All of the above

Q. De Duve discovered lysosomes from

1. Orchid root cells
2. Rat kidney cells
3. Leaf cells.
4. Rat liver cells

Q. Which of the following crosses will give only recessive progeny in ${\text{F}}_1$ generation?

1. TT x tt
2. tt x tt
3. TT x TT
4. Tt x tt