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,...
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![In an I. bio cell, chromosome #1 contains the alpha gene (which has dominant [A] and recessive [a] alleles) and chromosome #2 contains the beta gene (which has dominant [B] and recessive [b] alleles).
i) Which of the cells below depicts cell in G1 that is heterozygous genotype for both genes?
**Explanation of Diagrams:**
- **Cell #1:**
- Contains two chromosomes, each with a different allele: A on one chromatid and a on the other for the alpha gene, and B on one chromatid and b on the other for the beta gene. This cell is heterozygous for both genes.
- **Cell #2:**
- Shows duplicated chromosomes with distinct alleles: A and B on one set, a and b on another. This is not heterozygous for both genes as they are on separate chromosomes.
- **Cell #3:**
- Contains two chromosomes with pairs as follows: A on one chromatid and b on another for the alpha gene, and a on one chromatid and B on the other for the beta gene. This cell doesn't show heterozygosity for both genes.
- **Cell #4:**
- Displays duplicated chromosomes similar to Cell #2 with A, B, a, and b alleles. This configuration is not heterozygous for both genes.
**Conclusion:**
Cell #1 best depicts a cell in G1 that is heterozygous for both the alpha and beta genes, as it contains both the dominant and recessive alleles for each gene on separate chromatids.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe927df63-f1e3-498b-a31a-923bb5077d27%2Ff453b820-9708-4781-99d1-a152a79b8bae%2Fupbq1am_processed.png&w=3840&q=75)
Transcribed Image Text:In an I. bio cell, chromosome #1 contains the alpha gene (which has dominant [A] and recessive [a] alleles) and chromosome #2 contains the beta gene (which has dominant [B] and recessive [b] alleles).
i) Which of the cells below depicts cell in G1 that is heterozygous genotype for both genes?
**Explanation of Diagrams:**
- **Cell #1:**
- Contains two chromosomes, each with a different allele: A on one chromatid and a on the other for the alpha gene, and B on one chromatid and b on the other for the beta gene. This cell is heterozygous for both genes.
- **Cell #2:**
- Shows duplicated chromosomes with distinct alleles: A and B on one set, a and b on another. This is not heterozygous for both genes as they are on separate chromosomes.
- **Cell #3:**
- Contains two chromosomes with pairs as follows: A on one chromatid and b on another for the alpha gene, and a on one chromatid and B on the other for the beta gene. This cell doesn't show heterozygosity for both genes.
- **Cell #4:**
- Displays duplicated chromosomes similar to Cell #2 with A, B, a, and b alleles. This configuration is not heterozygous for both genes.
**Conclusion:**
Cell #1 best depicts a cell in G1 that is heterozygous for both the alpha and beta genes, as it contains both the dominant and recessive alleles for each gene on separate chromatids.
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