Question

Genetics Spring 2020 99 of 103 > <Mendellen Genetics Problem 3.22 Review Part A Draw all possible conclusions concerning the mode of inheritance of the trail expressed in each of the following limited pedigrees. Each case is based on Select the three correct statements. B Under the condition of recessiveness, both 1-1 and IH would be heterozygous: 1-2 and 1-3 are homozygous Under the condition of recessiveness, both if- and 114 would be homozygous: 1-2 and 3 are heterozygous thetratis dominant, then l-1 is homozygous and I 2 is heterozygous the trait is receive then 1-1 is heterozygous, as are 1-2 and 1-3 of the trait is dominant, then it is heterozygous, as are il 2 and 3 if the trait is receive then it is homozygous and 2 is heterozygous Submit Best A Part B

Answer 1

Three correct statements are given below

• Under the condition of recessiveness,both II-1 and II-4 would be heterozygous; II-2 and II-3 are homozygous.Recessive trait affect the person having both the recessive genes only, ie homozygous recessive.Heterozygous and homozygous dominant individuals are un affected in such traits.
• If the trat is dominant then I-1 is heterozygous,as are II-2 and II-3.Dominant trait affect both heterozygous and homozygous dominant individuals because a single dominant allele is enough to show the expression.Homozygous recessive individuals are unaffected.
• If the trait is recessive,then I-1 is homozygous and I-2 is heterozygous.I-1 is homozygous recessive and I-2 is heterozygous dominant.

Other options are wrong.Reason explained earlier in bold sentences.