In dominant epistasis,gene is a dominant gene.In Cucurbita pepo,gene for white fruit colour (w) is epistatic over yellow(Y) which is dominant over green(y).What will be the ratio of fruits colour in the cross WwYy(white)×Wwyy(white)

1.  9 white:7 yellow

2.  12 white:3 green:1 yellow

3.  12 white:3 yellow:3 green

4.  6 white:1 yellow:1 green

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4
Correct Answer :

6 white:1 yellow:1 green


Explanation :
No Explanation available for this question

In F2 generaton,a ratio of 1:4:6:4:1 is obtained instead of 9:3:3:1 when two pairs of genes are considered,it indicates

1.  Pleiotropic effect of genes

2.  Quantitative inheritance

3.  Incomplete dominance

4.  Qualitative inheritance

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4
Correct Answer :

Quantitative inheritance


Explanation :
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In rice plant,the presence of gene P causes its leaves to be coloured deep purple.But if the gene I is present then the purple colour is inhabited and the leaf becomes normally green.What is the ratio in F2 generation of green and purple plants

1.  9:7

2.  9:6:1

3.  12:3:1

4.  13:3

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4
Correct Answer :

13:3


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When a wheat variety of red kernel is crossed with white kerneled wheat,the F2 ratio would be

1.  1:10:4:1

2.  9:7

3.  1:2:4:2:4:2:1

4.  1:4:6:4:1

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4
Correct Answer :

1:4:6:4:1


Explanation :
No Explanation available for this question

mating between black rats of identical genotype produced offspring-14 creamy,47 black black and 19 albino.What epistatic ratio is expected and what type of epistasis is operative

1.  1:2:1, incomplete dominance

2.  9:3:4,recessive epistasis

3.  12:3:1,dominant epistasis

4.  None of the above

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4
Correct Answer :

9:3:4,recessive epistasis


Explanation :
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If a negro marries a white skin female,the mulattoes are born.If such mulattoes intermarry progeny will show a gradual graduation of skin colour in ratio of

1.  1:4:6:4:1

2.  9:3:3:1

3.  1:6:15:20:15:6:1

4.  1:4:6:15:20:15:6:4:1

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4
Correct Answer :

1:6:15:20:15:6:1


Explanation :
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Superiority of hybrid over its parents is called hybrid vigour(heterosis).it is maximum in corn or maize.It was given by

1.  Camerarius

2.  Shull

3.  Bateson and Punnett

4.  Fairchild

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4
Correct Answer :

Shull


Explanation :
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A black female is test crossed,producing 6 black offspring.The probability that a black heterozygous female would do this by chance alone is approximately

1.  50%

2.  25%

3.  1%

4.  Cannot be determined from the information given

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4
Correct Answer :

1\%


Explanation :
No Explanation available for this question

In a parental cross-AA BB CC DD EE × aa bb cc dd ee describe (i)how many different gametes can be formed in F1 generation (ii)how many different genotypes are expected in F2?

1.  72,229

2.  32,523

3.  32,563

4.  32,243

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4
Correct Answer :

32,243


Explanation :
No Explanation available for this question

Short hair is due to a dominant gene L and long hair to its recessive allele 1(in rabbit).A cross between a short-haired female and a long haired male produces a litter of 1 long haired and 7 short haired bunnies.What are the genotypes of the parents

1.  LL(male)×11(female)

2.  11(male)× Ll(female)

3.  L1(female)× 11(male)

4.  L1(male)×11(female)

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4
Correct Answer :

L1(female)× 11(male)


Explanation :
No Explanation available for this question
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