6) Consider the maternal effect gene that controls snail coiling where D= dextral, dominant, d=sinistral, recessive. Indicate the genotype(s) and phenotype(s) of offspring from the following crosses - females are written on the left, males on the right for each cross. Progeny Genotype(s) (Include ratio) Progeny Phenotype(s) (Include ratio) 1. Dd x Dd 2. dd x Dd 3. Dd x DD 4. Dd x dd
6) Consider the maternal effect gene that controls snail coiling where D= dextral, dominant, d=sinistral, recessive. Indicate the genotype(s) and phenotype(s) of offspring from the following crosses - females are written on the left, males on the right for each cross. Progeny Genotype(s) (Include ratio) Progeny Phenotype(s) (Include ratio) 1. Dd x Dd 2. dd x Dd 3. Dd x DD 4. Dd x dd
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What are progeny genotypes and
Transcribed Image Text:**Question 6**: Consider the maternal effect gene that controls snail coiling where D = dextral, dominant, and d = sinistral, recessive. Indicate the genotype(s) and phenotype(s) of offspring from the following crosses—females are written on the left, males on the right for each cross.
| | 1. Dd x Dd | 2. dd x Dd | 3. Dd x DD | 4. Dd x dd |
|------------------------|------------|------------|------------|------------|
| **Progeny Genotype(s)** (Include ratio) | | | | |
| **Progeny Phenotype(s)** (Include ratio) | | | | |
The table above is designed to analyze genetic crosses involving a maternal effect gene in snails. The columns delineate different mating combinations, where each genotype combination results in various offspring genotypes and corresponding phenotypes. The goal is to calculate the predicted genotypic and phenotypic ratios for each cross.
Expert Solution
Croos 1. Dd X Dd
The table shown below is a punnet square showing a monohybrid cross between Dd and Dd.
| D | d | |
| D | DD | Dd |
| d | Dd | dd |
Genotypic ratio is DD:Dd:dd = 1:2:1
since D is dominant over d, DD, Dd show dextral coiling, and dd shows sinistral coiling.
So phenotypic ratio is Dextral:Sinistral = 3:1
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