The Punnett Tool

Q.

A cross between two snapdragon varieties - one with red flowers and one with white flowers produces $F_1$ hybrids all with pink flowers . This is an example for

1. codominance

2. complete dominance

3. incomplete dominance

4. Multiple allelism

Q.

What is the phenotypic ratio of progeny, when a hetrozygous plant with dominant red flowers is crossed with a homozygous plant with recessive white flowers?

1. 1 : 1

2. 9 : 3 : 3 : 1

3. 3 : 1

4. 1 : 2 : 1

Q. Define the following:
(a) Genetics
(b) Punnett square
If a pea plant homozygous (pure) for tall is crossed with one homozygous (pure) for dwarf. What will be the appearance of (i) F1 and (ii) F2 progenies?
[The character of tallness (T) is dominant over dwarfness(t)]

Q. In pea plants, yellow seeds are dominant over green seeds. If yellow seeded plant (Yy) is crossed with a green seeded plant, then what ratio of yellow and green seeded plants would be observed in their progenies?

मटर के पादपों में पीले बीज हरे बीज पर प्रभावी होते हैं। यदि पीले बीज वाले पादप (Yy) का संकरण हरे बीज वाले पादप के साथ करवाया जाता है तो पीले तथा हरे बीज वाले पादपों का कितना अनुपात उनके संततियों में अवलोकित होगा?

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

Q. In a homozygous pea plant, axial flowers (A) are dominant over terminal flowers (a).

(i) What is the phenotype and genotype of the F, generation if a plant bearing pure axial flowers is crossed with a plant bearing pure temiinal flowers?

(ii) Draw a Punnett square board to show the gametes and offsprings when both the parent plants are heterozygous for axial flowers.

(iii) What is the phenotypic ratio and genotypic ratio of the above cross shown in (ii) ?

(iv) State Mendels Law of Dominance.

(v) Name two genetic disorders commonly seen in human males.

Q. In case of incomplete dominance, the monohybrid ratio of phenotypes in F${}_2$ generation is

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

Q. More than One Answer Type
एक से अधिक उत्तर प्रकार के प्रश्न

What should be the genotype of progeny produced by a cross between pea plants having the genotypes RrYy and RRyy?

जीनप्ररूप (जीनोटाइप) RrYy तथा RRyy वाले मटर पादपाें के बीच होने वाले संकरण द्वारा उत्पन्न संतति का जीनप्ररूप (जीनोटाइप) क्या होगा?

1. RrYy and RRyy
   
   RrYy तथा RRyy
2. Rryy and RRYy
   
   Rryy तथा RRYy
3. RRyy and RrYY
   
   RRyy तथा RrYY
4. rryy and RRyy
   
   rryy तथा RRyy

Q. The genotypic ratio of the monohybrid cross in the F2 generation is _______.

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

Q. Heterozygous purple-flowered plant was crossed with homozygous recessive white-flowered plant. The observed phenotype is

1. All white
2. 50% purple, 50% white
3. All purple
4. 75%

Q. The genotypic ratio of the monohybrid cross in the F2 generation is _______.

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

Q. The allele for the black coat colour (B) is dominant over the allele for white coat colour (b) in horses. A cross between two black horses produces a foal with white coat colour. The probability of the second foal having black coat would be

1. 1/4
2. 3/4
3. 1
4. 0
5. 1/2

Q.

A chart that represents the possible gene combinations of progeny in a known cross is called:

1. Pedigree chart

2. Gene map

3. Punnett square

4. Linkage map

Q.

A homozygous tall plant (T) bearing red coloured (R) flowers is crossed with a homozygous Dwarf plant (t) bearing white flowers (r) :-

1. Give the genotype and phenotype of F1 generation

2. give the possible combinations of the gamets that can be obtained from the F1 hybrid

Q.

What is the expected F2 phenotypic ratio when two white flowers of Lathyrus odoratus are crossed with each other?

Q. A self-pollinating plant with orange flowers and alternating leaf arrangement produces
Plants with red flowers and alternating leave- 47
Plants with orange flowers and alternating leaves- 103
Plants with yellow flowers and alternating leaves- 51
If a yellow-flowered offspring were self-pollinated, what would the resulting plant's flowers look like?

1. 100% yellow
2. 100% red
3. 100% orange
4. 50% yellow, 50% red
5. 75% red, 25% yellow

Q. Ratio of progeny when a red colored heterozygote is crossed with a white colored plant in which red color characteristic is dominant over white color is

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

Q.

A self-pollinating plant with orange flowers and alternating leaf arrangement produces
Plants with red flowers and alternating leave- 47
Plants with orange flowers and alternating leaves- 103
Plants with yellow flowers and alternating leaves- 51

Suppose the original parent plant is cross-pollinated with a plant that has red flowers and non-alternating leaves. All of the resulting offsprings have non-alternating leaves. Which of the following is/are true?

1. The allele for alternating leaves is recessive.
2. Approximately half of the offsprings have red flowers.
3. Both A and B.
   
4. None of the offsprings have orange flowers.
5. Both B and C.
   

Q. The cross-over percentage between linked genes is (a) J and M - 20% (b) J and L - 35% (c) J and N -20% (d) L and K -15% (e) M and N - 50% (f) M and L - 15%. The sequence of genes on the chromosomes is

1. J, N, M, L, K
2. J, M, L, N, K
3. J, M, L, K, N
4. M, J, L, K, N

Q.

Tommorow is My Exam HELP

In a cross between plants with purple flowers and plants with white flowers the off springs