Genetics of Hair and Tongue Traits

The video tutorial covers a genetics worksheet focusing on traits like tongue folding, hair color, and hair shape. It explains how to use punnett squares to determine genotypes and phenotypes of offspring based on parental traits. The tutorial provides step-by-step guidance on setting up punnett squares and interpreting results, emphasizing the dominance of certain traits over others.

What is the dominant trait for tongue folding?

• Being able to fold the tongue

• Not being able to fold the tongue

• Having a long tongue

• Having a short tongue

If a mother is heterozygous for tongue folding and the father is homozygous dominant, what is the probability that their child will be a non-folder?

• 100%

• 75%

• 50%

• 25%

What are the possible genotypes for a person with brown hair?

• Homozygous recessive

• Homozygous dominant or heterozygous

• Heterozygous only

• Homozygous dominant only

In a Punnett square where both parents are heterozygous for brown hair, what is the probability of having a child with blonde hair?

• 0%

• 25%

• 50%

• 75%

If one parent is homozygous dominant and the other is heterozygous for brown hair, what is the probability that their child will have brown hair?

• 25%

• 50%

• 100%

• 75%

What is the dominant trait for hair shape?

• Straight hair

• No hair

• Curly hair

• Wavy hair

If a woman with curly hair and a man with straight hair have children, and all children have straight hair, what can be inferred about the woman's genotype?

• She is homozygous recessive

• She is heterozygous

• She is homozygous dominant

• Her genotype cannot be determined

Why can't a woman with curly hair be homozygous dominant if all her children with a straight-haired man have straight hair?

• Because curly hair is recessive

• Because she must pass on a recessive allele

• Because all children must have curly hair

• Because straight hair is dominant

What is the probability of having a curly-haired child if one parent is heterozygous and the other is homozygous recessive for hair shape?

• 100%

• 25%

• 50%

• 75%

In a cross between a heterozygous curly-haired individual and a straight-haired individual, what is the expected ratio of curly to straight-haired offspring?

• 2:2

• 1:3

• 3:1

• 1:1