Genetics | Dihybrid Cross (Example 2)

Genetics | Dihybrid Cross (Example 2)

Assessment

Interactive Video

Science, Biology

University

Hard

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The video tutorial explains the process of performing a dihybrid cross, focusing on genes A and B, which code for height and speed, respectively. Both maternal and paternal genotypes are heterozygous for these genes. The tutorial covers setting up the dihybrid cross, filling in the 16 cells, and calculating both genotypic and phenotypic ratios. It emphasizes the importance of correctly setting up the cross and provides a shortcut for memorizing the phenotypic ratio of 9:3:3:1 when crossing two heterozygotes.

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10 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What do genes A and B represent in the dihybrid cross example?

A is for weight, B is for height

A is for speed, B is for color

A is for height, B is for speed

A is for color, B is for texture

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many cells are there in a dihybrid cross grid?

12

16

8

4

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the first step in setting up a dihybrid cross?

Determining the phenotypic ratio

Arranging alleles in columns and rows

Calculating the genotypic ratio

Filling in the cells

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the genotypic ratio for a dihybrid cross with heterozygous parents?

16:0

3:1

9:3:3:1

1:1:1:1

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which phenotype corresponds to the genotype 'big A, big A, little b, little b'?

Tall and slow

Short and fast

Short and slow

Tall and fast

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many individuals are tall and fast in the phenotypic ratio?

3

6

12

9

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the phenotypic ratio for a dihybrid cross with heterozygous parents?

16:0

3:1

1:1:1:1

9:3:3:1

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