Ma smiya farhad DIHYBRID CROSS PRACTICE 1. In grasshoppers, the body color of br

Question

Ma smiya farhad DIHYBRID CROSS PRACTICE 1. In grasshoppers, the body color of brown is dominant over green. Also, having strong legs is dominant over e weak legs. A heterozygous brown, homozygous strong-legged male meets a heterorygous brown omozygous weak legged female. efi a Male genotype: b. Female Male possible gametes: Female possible gametes. Exa genotype: Pra They produce a number of offipring. Complete the following c. Phenotypic Ratio: d. What percentage of the offspring will exhibit both dominant traits? e, what percentage of the offspring will have a brown body and weak legs? f. What are the chances of having a green grasshopper with strong legs?i In Zorks, blue tail feathers are dominant and red ones are recessive. Also, long toes are dominant and shor toes are recessive. Cross a homozygous blue-tailed. heterozygous long-loed Zork (male) with a homozygous red-tailed, short-toed Zork (female). 2. E: a. Male genotype: Male possible gametes: They produce a number of offspring. Complete the following. c. Phenotypic Ratio: d. What percentage of the offspring will exhibit both dominant traits? e, what percentage of the offspring will have a blue tail and shontos? . What are the chances of having a blue-feathered Zork with long toes? in

Explanation / Answer

Ie., BbLL    X     Bbll

       MALE          FEMALE

2. Let us denote dominant blue feather as 'BB' and recessive red feather as 'bb'. Dominant long toes are represented by 'LL' and short toes as 'll'.

Here, the cross is made between homozygous blue tailed, heterozygous long toed zork (BBLl) and a homozygous red tailed, short toed zork (bbll).

BBLl     X    bbll

MALE       FEMALE

a)Male genotype BBLl and possible gametes BL and Bl

b) Female genotype bbll and possible gamete bl

c) Phenotypic ratio is 1:1

d) 50% will show dominant trait.

e) 50 % will have blue tails and short toes.

f) Chances of having blue feathered zork with long legs is 1in2

3. Let us denote dominant trait barking as 'BB' and recessive trait silencer as 'bb'. Dominant erect ears are represented as 'EE' and droopy ears as 'ee'.

BbEe      X      BbEe

MALE             FEMALE

4. Let us denote dominant black coat colour as 'BB' and recessive chestnut as 'bb'.

Dominant allele trotting gait is represented as 'TT' and recessive pacing gait as 'tt'.

     BbTt     X    bbtt

    MALE          FEMALE

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