Could someone please help me with this practice problem?Having a hard time tryin

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Could someone please help me with this practice problem?Having a hard time trying to figure it out. In a certain plant, trait A (stemlength) is controlled by two alleles which interact bycomplete dominance. Trait B (seed color) is controlled by twoalleles; brown color recessive to black color; however, the allelethat produces black color is a homozygous lethal allele. TraitD (leaf coloration) is controlled by two alleles with variegatedphenotype being recessive to plain coloration. Based on thisinformation: A. Describe the phenotype of a plantheterozygous for all these genes B. Predict the proportion of offspringthat that will be Tall with black seeds and variegated leaves iftwo heterozygous plants are mated C. Predict the proportion of offspringthat will be homozygous for all three genes if two heterozygousplants are mated. Show as much work aspossible Could someone please help me with this practice problem?Having a hard time trying to figure it out. In a certain plant, trait A (stemlength) is controlled by two alleles which interact bycomplete dominance. Trait B (seed color) is controlled by twoalleles; brown color recessive to black color; however, the allelethat produces black color is a homozygous lethal allele. TraitD (leaf coloration) is controlled by two alleles with variegatedphenotype being recessive to plain coloration. Based on thisinformation: A. Describe the phenotype of a plantheterozygous for all these genes B. Predict the proportion of offspringthat that will be Tall with black seeds and variegated leaves iftwo heterozygous plants are mated C. Predict the proportion of offspringthat will be homozygous for all three genes if two heterozygousplants are mated. Show as much work aspossible

Explanation / Answer

, Trait A (stem length) is controlled by two alleles whichinteract by complete dominance

Tall –T- dominant

,Short-t- recessive

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Trait B (seed color) is controlled by two alleles;

black color-----B ---dominant

brown color---------- recessive -b

BB-----------black color is a homozygous lethal allele.

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Trait D (leaf coloration) is controlled by two alleles withvariegated phenotype being recessive to plain coloration

plain coloration----------------V----------- dominant

variegatedphenotype-----v---------- recessive

A.     Describe the phenotype of a plantheterozygous for all these genes

                             Tt BbVv--------------     Tall,  black color , plain coloration

B. Predict the proportion of offspring that that will be Tallwith black seeds and variegated leaves if two heterozygous plantsare mated

                     TtBbVv                x               Tt         Bb         Vv

½            ½           ½                                   ½          ½          ½

Tall dominant=        ½  x         ½

black seeds dominant = ½  x         ½

variegated ---recessive = ½  x         ½

                =1/64

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Predict the proportion of offspring that will be homozygous forall three genes if two heterozygous plants are mated.

                     TtBbVv                x               Tt         Bb         Vv

½            ½           ½                                   ½          ½          ½

              ttbbvv   =1/64

TT BBVV -LETHAL ANDELIMINATED

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