Normal hearing in humans is determined by the presence of two dominant genes D and E. If the person has only one dominant gene (D-ee, ddE-) or all recessive (ddee) he is deaf. Deaf parents have seven children with normal hearing. Determine the genotypes of the parents. Determine the form of gene interaction.
Answers
Explanation:
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Answer:The parents of these children are heterozygous, their genotypes are DDEE and DDee. The form of interaction between these dominant and recessive genes is co-dominance.
Explanation:
Dominant genes D and E are in complete dominance. So, if a person has only one dominant gene - D or E, then he will have normal hearing. If a person has two dominant genes - DD or DE, then he will have normal hearing. If a person has only two recessive genes, then he/she will be deaf. So, as the parents have normal hearing, they must have one dominant and one recessive genes. The child can have only two genotypes - DDEE and DDEe. The possible form of gene interaction between D and E is codominance. In codominance, both D and E are expressed separately and are seen together, but in a hybrid the two genes can be expressed together. In this case, D and E gene are expressed separately, hence D and E are dominant.
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