Respuesta :
Answer:
Homozygous
Explanation:
Mendel is known as the father of genetics. The concept of dominance and recessive trait was explained by Mendel while working on the pea plant Pisum sativum.
The individual has two alleles for a particular trait. The dominant trait is expressed in the individual in homozygous dominant and in heterozygous condition as well. The recessive trait is only observed in case of homozygous recessive condition. The dominant trait hides the expression of recessive trait in heterozygous condition.
Thus, the correct answer is option (3).
In complete dominance, the dominant allele hides the expression of the recessive allele. If the dominant allele is not present, then a recessive trait will be observed in individuals that are _H0M0ZYG0US_ for that trait.
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Assuming Mendelian inheritance, with the gene expressing complete dominance, we might say that
A recessive trait will be observed in individuals that are _H0M0ZYG0US_ for that trait.
COMPLETE DOMINANCE
- When the dominant allele completely masks the recessive allele, we talk about complete dominance.
- Individuals that are heter0zyg0us for a particular gene, carry the dominant and recessive alleles, but only express the dominant trait.
- The dominant allele is hiding the expression of the recessive allele.
So let us suppose there is a diallelic gene coding for fruit shape. This gene expresses complete dominance, so
Alleles:
- R is the dominant allele and codes rounded fruits
- r is the recessive allele and codes for elongated fruits
Genotype Phenotype
RR H0m0zyg0us dominant Rounded fruit Dominant trait
Rr Heter0zyg0us Rounded fruit Dominant trait
rr H0m0zyg0us recessive Elongated fruit Recessive trait
According to the theoretical framework and the example, the recessive trait will be observed in individuals that are _h0m0zyg0us recessive_ for that trait.
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