Is the allele for mental retardation dominant or

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for the allele for mental retardation. Is the allele for mental retardation dominant or recessive? What are the chances of their having one mentally retarded child? What are the chances that all of their children (they plan a family of four) will be mentally retarded? Genetic Determination of Selected Human Characteristics 14. Look back at your data to complete this section. For each of the situations described here, determine if an offspring with the characteristics noted is possible with the parental genotypes listed. Check ( ) the appropriate column. Possibility Parental genotypes Phenotype of child Yes No Jj jj Double-jointed thumbs LL Ll Straight little finger EE ee Detached ear lobes HH Hh Proximal finger hair I A i I B i Type O blood I A I B ii Type B blood 15. You have dimples, and you would like to know if you are homozygous or heterozygous for this trait. You have six brothers and sisters. By observing your siblings, how could you tell, with some degree of certainty, that you are a heterozygote? he empirical probability is approximately 12.5%. P(girl) = 0 X X X X X X If any of your brothers or sisters have dimples, then you could be homozygous dominant or heterozygous, you c If all your brothers and sisters have dimples, then your homozygous dominant.
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