POST LAB: LABORATORY 9: 1) what is the difference between a homozygous individua

Question

POST LAB: LABORATORY 9: 1) what is the difference between a homozygous individual and a heterozygous individual 2) in a population, are dominant characteristics always more frequent than recessive ones? Explain. 3) If offspring exhibit a 3:1 phenotype ratio, what are it’s parents genotypes?
POST-LAB: LABORATORY9 QUESTIONS 1. What is the difference between a homozygous individual and a heterozygous individual? 2. In a population, are dominant characteristics always more frequent than recessive ones? Explain: 3. If offspring exhibit a 3:1 phenotypic ratio, what are its parent's genotypes? Laboratory 9 Genetics: Post-Lab 159

Explanation / Answer

Ans. #1. Homozygous individual have the same allele on both the loci. They can either be homozygous dominant or homozygous recessive. Homozygous dominant individuals present dominant phenotype whereas homozygous recessive present recessive phenotype.

# A heterozygous individual has two different alleles of at the gene locus. Such individuals present the dominant phenotype (if inheritance of allele is complete dominance), or intermediate phenotype (Incomplete dominance) or both the dominant and recessive phenotypes simultaneously (Co-dominance).

#2. The dominant phenotype is expressed in both homozygous individuals as well as the heterozygotes whereas the recessive phenotype is expressed only in homozygous recessive individuals. Therefore, the dominant phenotype is more frequent that the recessive phenotype.

#3. Both the parents are heterozygous.

#4. Purple flower color, denoted by capital letter P for the Dominant phenotype.

#5. All the flowers will be purple.

#6. Phenotype ratio = purple : white = 60 : 4 = 15 : 1

No, if both the parents were heterozygous, the phenotype ratio should have been 3:1.

#7. # A Punnett square represents the cross between parental gametes. It gives expected phenotype and genotype ratio of progeny in the specfied generation.

A pedigree is a pictorial representation of inheritance of one or more characterisitcs through generations along the family tree. It gives the actual phenotype and genotype ratio in the population – for several generation.

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