A gene with two dominant alleles that are expressed and create a new trait 1 point
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Answer and Explanation:
Deafness is a physiological disorder where hearing is impaired. Apart from genetics, this may be caused by infections of the inner or middle ear, toxins and noise exposure. In genetic cases, this may be caused by a mutation in a recessive autosomal gene.
Punnett squares are diagrams that show the product of hybrid trait crosses by genetic breeding.
For this cross...
Assuming deafness= recessive
Parent generation or P generation:
gametes: Dd → Not deaf i.e. normal dominant (D), deafness recessive (d)
Heterozygousity describes the allelic makeup; these traits comprise two varying forms of a gene. However, homozygous traits comprise identical forms of the gene.
Male: An → without deafness Dd
Female: dd → deaf
genotypes and phenotypes for parent and offspring...
Assuming heterozygousity of the male , for the cross
P generation: Dd × dd
Not Deaf × Deaf
F1 generation:
genotype: Dd × dd ...(from punnet square)
phenotype: 2 without deafness : 2 deaf
1 : 1
<u><em>∴ 50% are genotypically heterozygous while 50% is homozygous , 2 without deafness ; 2 deaf</em></u>
