Table of Contents

- 1 Which of the following crosses will lead to a 9 3 3 1 ratio of phenotypes?
- 2 In which kind of cross would you expect to find a ratio of 9 3 3 1 among the F2 offspring quizlet?
- 3 In which kind of cross would you expect to find a phenotypic ratio?
- 4 What is the phenotype ratio of the F1 generation of a Monohybrid cross in a classic Mendelian experiment?
- 5 What is the Mendelian ratio for monohybrid inheritance?
- 6 What is the ratio of phenotypes in a dihybrid cross?
- 7 How did Mendel show that offspring do not depend on parentage?

## Which of the following crosses will lead to a 9 3 3 1 ratio of phenotypes?

SsYy dihybrid cross

A phenotypic ratio of 9:3:3:1 is predicted for the offspring of a SsYy x SsYy dihybrid cross.

## In which kind of cross would you expect to find a ratio of 9 3 3 1 among the F2 offspring quizlet?

One factor must be dominant and one factor recessive in each individual. In which kind of cross would you expect to find a ration 3:1 among the F2 offspring? monohybrid cross. Some plants fail to produce chlorophyll, and this trait appears to be recessive.

**Which of the given cross will result in 9 is to 3 is to 3 is to 1 phenotypic ratio?**

dihybrid cross

This 9:3:3:1 phenotypic ratio is the classic Mendelian ratio for a dihybrid cross in which the alleles of two different genes assort independently into gametes. Figure 1: A classic Mendelian example of independent assortment: the 9:3:3:1 phenotypic ratio associated with a dihybrid cross (BbEe × BbEe).

### In which kind of cross would you expect to find a phenotypic ratio?

Monohybrid Cross: When two dominant parents produce a 3:1 phenotypic ratio in the offspring, it indicates that both parents are heterozygous. Dihybrid Cross: Both parents are heterozygous, and one allele for each trait exhibits complete dominance *.

### What is the phenotype ratio of the F1 generation of a Monohybrid cross in a classic Mendelian experiment?

The phenotypic ratio in this case of Monohybrid cross is 1.

**What is the expected phenotypic ratio of a Mendelian monohybrid cross quizlet?**

We call this 3:1 ratio the Mendelian monohybrid ratio. The 3:1 ratio is actually 1:2:1. Mendel then examined the F2 and found the recessive F2 plants always bred true, but only one out of three dominant F2 bred true.

## What is the Mendelian ratio for monohybrid inheritance?

Since there are three dominant phenotypes to one recessive, the common ratio is 3:1. http://images.tutorvista.com/content/heredity-and-variation/mendels-monohybrid-inheritance.jpeg There is also a common ratio for a dihybrid cross: 9:3:3:1.

## What is the ratio of phenotypes in a dihybrid cross?

This is the ratio of phenotypes in a dihybrid cross. If both parents are heterogeneous for both traits the ratio of phenotypes is the ratio of 9:3:3:1. One trait is dominant and the other trait is recessive. Of the 16 possible offsprings only 1 will have both recessive genes.

**How to determine if your data fits a Mendelian ratio?**

An important question to answer in any genetic experiment is how can we decide if our data fits any of the Mendelian ratios we have discussed. A statistical test that can test out ratios is the Chi-Square or Goodness of Fit test. Let’s test the following data to determine if it fits a 9:3:3:1 ratio.

### How did Mendel show that offspring do not depend on parentage?

Mendel was the first to show that the characteristics of the progeny produced by a cross do not depend on which parent is the male and which the female. In this example, the seeds of the hybrid offspring are round whether the egg came from the round variety and the pollen from the wrinkled variety (A) or the other way around (B).