Consider the maternal effect gene that controls snail coiling where D = dextral, dominant, d = sinistral, recessive. Indicate the genotype(s) of offspring from the following crosses - females are written on the left, males on the right for each cross. Progeny Genotype(s) (include ratios) Progeny Phenotype(s) (include ratios) 1. Dd x Dd 2. dd x Dd 3. Dd x DD 4. Dd x dd

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
icon
Related questions
Topic Video
Question

Need help, please.

**Title: Investigating Maternal Effect Genes in Snail Coiling**

**Overview:**
This educational resource explores the genetic basis of snail shell coiling, specifically focusing on the maternal effect gene. In these snails, the direction of coiling is dictated by genetic factors: 'D' represents the dextral (right-handed) dominant allele, while 'd' indicates the sinistral (left-handed) recessive allele.

**Instructions:**
Analyze the following genetic crosses to determine the genotype and phenotype ratios of the progeny. In each cross, the genotype of the female is listed first, and the genotype of the male second.

**Crosses and Results:**

1. **Cross 1: Dd (female) x Dd (male)**
    - Progeny Genotype(s) (include ratios): __________
    - Progeny Phenotype(s) (include ratios): __________

2. **Cross 2: dd (female) x Dd (male)**
    - Progeny Genotype(s) (include ratios): __________
    - Progeny Phenotype(s) (include ratios): __________

3. **Cross 3: Dd (female) x DD (male)**
    - Progeny Genotype(s) (include ratios): __________
    - Progeny Phenotype(s) (include ratios): __________

4. **Cross 4: Dd (female) x dd (male)**
    - Progeny Genotype(s) (include ratios): __________
    - Progeny Phenotype(s) (include ratios): __________

**Conclusion:**
Fill in the blanks for each cross to understand how the maternal effect gene influences phenotypic outcomes in snail shell coiling. Consider how dominance and recessiveness affect these outcomes in relation to maternal inheritance patterns. 

**Note:**
Remember, although genotypic ratios provide the foundation, phenotype expression depends significantly on the maternal genotype due to its effect on the developmental environment.
Transcribed Image Text:**Title: Investigating Maternal Effect Genes in Snail Coiling** **Overview:** This educational resource explores the genetic basis of snail shell coiling, specifically focusing on the maternal effect gene. In these snails, the direction of coiling is dictated by genetic factors: 'D' represents the dextral (right-handed) dominant allele, while 'd' indicates the sinistral (left-handed) recessive allele. **Instructions:** Analyze the following genetic crosses to determine the genotype and phenotype ratios of the progeny. In each cross, the genotype of the female is listed first, and the genotype of the male second. **Crosses and Results:** 1. **Cross 1: Dd (female) x Dd (male)** - Progeny Genotype(s) (include ratios): __________ - Progeny Phenotype(s) (include ratios): __________ 2. **Cross 2: dd (female) x Dd (male)** - Progeny Genotype(s) (include ratios): __________ - Progeny Phenotype(s) (include ratios): __________ 3. **Cross 3: Dd (female) x DD (male)** - Progeny Genotype(s) (include ratios): __________ - Progeny Phenotype(s) (include ratios): __________ 4. **Cross 4: Dd (female) x dd (male)** - Progeny Genotype(s) (include ratios): __________ - Progeny Phenotype(s) (include ratios): __________ **Conclusion:** Fill in the blanks for each cross to understand how the maternal effect gene influences phenotypic outcomes in snail shell coiling. Consider how dominance and recessiveness affect these outcomes in relation to maternal inheritance patterns. **Note:** Remember, although genotypic ratios provide the foundation, phenotype expression depends significantly on the maternal genotype due to its effect on the developmental environment.
Expert Solution
Step 1

Shell coiling in snails can be dextral (coiling with the right hand) or sinistral (left hand coiling). In snails, the direction of coiling is genetically determined. While a recessive allele d controls the sinistral coiling, a dominant allele D regulates the dextral coiling.

DD- Dextral Snail

dd- Sinistral Snail

steps

Step by step

Solved in 3 steps with 1 images

Blurred answer
Knowledge Booster
Mitochondrial mutations
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
Biology
ISBN:
9780134580999
Author:
Elaine N. Marieb, Katja N. Hoehn
Publisher:
PEARSON
Biology 2e
Biology 2e
Biology
ISBN:
9781947172517
Author:
Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:
OpenStax
Anatomy & Physiology
Anatomy & Physiology
Biology
ISBN:
9781259398629
Author:
McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa Stouter
Publisher:
Mcgraw Hill Education,
Molecular Biology of the Cell (Sixth Edition)
Molecular Biology of the Cell (Sixth Edition)
Biology
ISBN:
9780815344322
Author:
Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter Walter
Publisher:
W. W. Norton & Company
Laboratory Manual For Human Anatomy & Physiology
Laboratory Manual For Human Anatomy & Physiology
Biology
ISBN:
9781260159363
Author:
Martin, Terry R., Prentice-craver, Cynthia
Publisher:
McGraw-Hill Publishing Co.
Inquiry Into Life (16th Edition)
Inquiry Into Life (16th Edition)
Biology
ISBN:
9781260231700
Author:
Sylvia S. Mader, Michael Windelspecht
Publisher:
McGraw Hill Education