Exploring Punnett Squares with Mr. T and Ms. D

The video tutorial introduces Punnett squares as a tool for understanding genetics, explaining how to use them to predict offspring genotypes and phenotypes. It provides examples of homozygous dominant, heterozygous, and different genotypes, illustrating how dominant and recessive traits are expressed. The tutorial includes practice exercises and instructions for completing worksheets to reinforce learning.

What is a Punnett square used for?

• To calculate the probabilities of genetic traits in offspring.

• To measure the height of plants.

• To determine the age of fossils.

• To analyze the chemical composition of DNA.

Tags

NGSS.MS-LS3-2

If both parents have homozygous dominant alleles (LL), what is the probability of their offspring having the same genotype?

• 50%

• 100%

• 25%

• 0%

In a cross between two homozygous recessive parents (ww), what is the probability of their offspring having a widow's peak?

• 0%

• 25%

• 50%

• 100%

What is the genotype of offspring from a cross between a homozygous dominant (TT) and a homozygous recessive (tt) parent?

• Tt

• Tt or tt

• tt

• TT

If curly hair is a dominant trait (T), what is the probability of offspring having curly hair if one parent is homozygous dominant (TT) and the other is homozygous recessive (tt)?

• 0%

• 25%

• 100%

• 50%

What is the probability of offspring being able to curl their tongue if one parent is homozygous dominant (CC) and the other is homozygous recessive (cc)?

• 100%

• 50%

• 25%

• 0%

What is the probability of offspring not being able to curl their tongue if one parent is homozygous dominant (CC) and the other is homozygous recessive (cc)?

• 0%

• 25%

• 50%

• 100%

In a cross between two heterozygous short-haired cats (Ss), what is the probability of their offspring having long hair?

• 50%

• 0%

• 75%

• 25%

What is the genotype of a heterozygous short-haired cat?

• Ss

• S

• ss

• SS

What is the purpose of the practice exercises and grading instructions provided in the video?

• To help students understand the concepts better through practice.

• To test students' knowledge on unrelated topics.

• To prepare students for a sports competition.

• To provide entertainment.