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Mendelian Genetics

The table representing the filial generations of the crosses between the parents having specified genetic traits as determined by the dominant and recessive alleles are given below . The table comprises of the genetic specification of the offspring as per genotype (specifying the allele distribution ) and phenotype (specifying the physical appearance

Scenario Number Genotype of Parent 1 Phenotype of Parent 1 Genotype of Parent 2 Phenotype of Parent 2 Ratio of Offspring Genotypes Ratio of Offspring Phenotypes 1 Gg

Grey

gg Black

1 :1 p

3 :1 2 LL

Long wing

ll Vestigial

NA (the offspring are similar in their genotype

NA (the offspring are similar in their phenotype 3 Gg

Grey

Gg

Grey

1 :2 :1

3 :1 4 Ll

Long wing

Ll Long wind

1 :2 :1

3 :1 5 LL

Long wing

Ll

Long wing

1 :1 NA (the offspring are similar in their phenotype )1 . For one of the monohybrid crosses you performed in this Investigation , describe how to use the phenotype ratios to determine the percentage of offspring displaying each trait

Ans : The cross involving only one contrasting character is known as monohybrid cross . The monohybrid cross , which has been performed in this investigation , has the phenotypic ratio of 3 :1 . That means in the experiment one and three the color of the 75 offspring will be grey and the remaining 25 will be black . In the experiments 2 , 4 , and 5 there will be 75 long wings and 25 short wings offspring . This is...

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