Table of contents

1. Introduction to Genetics51m
2. Mendel's Laws of Inheritance3h 37m
3. Extensions to Mendelian Inheritance2h 41m
4. Genetic Mapping and Linkage2h 28m
5. Genetics of Bacteria and Viruses1h 21m
6. Chromosomal Variation1h 48m
7. DNA and Chromosome Structure56m
8. DNA Replication1h 10m
9. Mitosis and Meiosis1h 34m
10. Transcription1h 0m
11. Translation58m
12. Gene Regulation in Prokaryotes1h 19m
13. Gene Regulation in Eukaryotes44m
14. Genetic Control of Development44m
15. Genomes and Genomics1h 50m
16. Transposable Elements47m
17. Mutation, Repair, and Recombination1h 6m
18. Molecular Genetic Tools19m
- Genetic Cloning
  9m
- Methods for Analyzing DNA
  9m
19. Cancer Genetics29m
- Overview of Cancer
  21m
- Cancer Mutations
  7m
20. Quantitative Genetics1h 26m
21. Population Genetics50m
- Hardy Weinberg
  19m
- Allelic Frequency Changes
  31m
22. Evolutionary Genetics29m

2. Mendel's Laws of Inheritance

Probability and Genetics

Genetics

2. Mendel's Laws of Inheritance

Probability and Genetics

Previous problemNext problem

2:15 minutes

Problem 6b

Textbook Question

Consider the cross AaBbCC × AABbCc.
Use a Punnett square to predict the expected ratio of offspring phenotypes.

Verified step by step guidance

Step 1: Identify the genotypes of the parents. Parent 1 has the genotype AaBbCC, and Parent 2 has the genotype AABbCc. Each gene pair represents alleles for a specific trait.

Step 2: Determine the possible gametes for each parent. For Parent 1 (AaBbCC), the possible gametes are ABC, AbC, aBC, and abC. For Parent 2 (AABbCc), the possible gametes are ABC, ABc, AbC, and Abc.

Step 3: Construct a Punnett square. Create a grid where the rows represent the gametes of Parent 1 and the columns represent the gametes of Parent 2. Fill in each cell with the combination of alleles from the corresponding row and column.

Step 4: Analyze the offspring genotypes in the Punnett square. For each cell, determine the genotype of the offspring by combining the alleles from the gametes. For example, a cell might contain AaBbCc.

Step 5: Predict the phenotypic ratios. Based on the dominance and recessiveness of the alleles, determine the phenotype for each genotype. Count the occurrences of each phenotype in the Punnett square to calculate the expected ratio of offspring phenotypes.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above

Video duration:

Play a video:

Was this helpful?

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Punnett Square

A Punnett square is a diagram used to predict the genotypes of offspring from a genetic cross. It organizes the possible combinations of alleles from each parent, allowing for a visual representation of inheritance patterns. By filling in the squares with the alleles from each parent, one can easily determine the expected ratios of different genotypes and phenotypes in the offspring.

Genotype and Phenotype

Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses for a particular gene. Phenotype, on the other hand, is the observable physical or biochemical characteristics of an organism, which result from the interaction of its genotype with the environment. Understanding the distinction between these two concepts is crucial for predicting how traits will be expressed in the offspring.

Mendelian Inheritance

Mendelian inheritance is the set of principles that describe how traits are passed from parents to offspring through alleles. It includes concepts such as dominance, segregation, and independent assortment. These principles help in predicting the ratios of different phenotypes in offspring, especially when dealing with multiple traits, as seen in the cross provided in the question.

Watch next

Master Probability with a bite sized video explanation from Kylia

Start learning

Related Videos

Related Practice

Textbook Question

A woman, S.R., had a maternal grandfather with hemophilia A (OMIM 306700), an X-linked recessive condition that reduces blood clotting. S.R.'s maternal grandmother and paternal grandparents are free of the condition, as are her partner, his parents, and his grandparents. S.R. has no siblings. She wants to know the chance that a son of hers will have the condition. What is that probability?

440

views

Textbook Question

Two parents plan to have three children. What is the probability that the children will be two girls and one boy?

532

views

Textbook Question

A 40-year-old woman whose father had Huntington disease currently shows no symptoms of the disease. She is newly pregnant with her first child and seeks your best estimate of the chance her child will inherit the disease. What is your estimate and how did you arrive at it? (Hint: See Figure 4.11)

387

views

Textbook Question

Consider the cross AaBbCC × AABbCc.

Use the forked-line method to predict the expected ratio of offspring phenotypes.

891

views

Textbook Question

Consider the cross AaBbCC × AABbCc.

How many different gamete genotypes can each organism produce?

443

views

Textbook Question

A couple with European ancestry seeks genetic counseling before having children because of a history of cystic fibrosis (CF) in the husband's family. ASO testing for CF reveals that the husband is heterozygous for the Δ508 mutation and that the wife is heterozygous for the R117 mutation. You are the couple's genetic counselor. When consulting with you, they express their conviction that they are not at risk for having an affected child because they each carry different mutations and cannot have a child who is homozygous for either mutation. What would you say to them?

408

views

Textbook Question

Determine whether the statements below are true or false. If a statement is false, provide the correct information or revise the statement to make it correct.

If a woman is heterozygous for albinism, an autosomal recessive condition that results in the absence of skin pigment, the proportion of her gametes carrying the allele that allows pigment expression is expected to be 75%.

381

views

Textbook Question

Determine whether the statements below are true or false. If a statement is false, provide the correct information or revise the statement to make it correct.

Reciprocal crosses that produce identical results demonstrate that a strain is pure-breeding.

419

views

Show more practices