Genetics and Pedigree Analysis

In this video, Cie, along with Snap the Snapdragon and Speck the Speckled Chicken, guides viewers through the basics of genetics. The tutorial covers how to read karyotypes, which are like family photos of chromosomes, and explains their role in identifying genetic disorders such as Down syndrome. It also delves into pedigrees, illustrating how traits are passed through generations, and discusses the differences between autosomal dominant and recessive traits. Finally, the video explores X-linked traits, highlighting how they manifest differently in males and females. By the end, viewers will have a foundational understanding of genetic inheritance patterns.

Who are the two friends helping Cie in the video?

• Snap the dragonfly and Speck the striped zebra

• Snap the sunflower and Speck the spotted cow

• Snap the daisy and Speck the dotted dog

• Snap the snapdragon and Speck the speckled chicken

What is a karyotype compared to in the video?

• A family photo of chromosomes

• A map of the human body

• A recipe for a cake

• A blueprint of a house

How many pairs of chromosomes do humans have?

• 23 pairs

• 24 pairs

• 22 pairs

• 21 pairs

What genetic disorder is associated with an extra chromosome at pair 21?

• Down syndrome

• Turner syndrome

• Edwards syndrome

• Klinefelter syndrome

What do circles and squares represent in a pedigree chart?

• Circles for males, squares for females

• Circles for females, squares for males

• Circles for parents, squares for offspring

• Circles for children, squares for adults

What does it mean if a trait appears in every generation of a pedigree?

• It is X-linked dominant

• It is X-linked recessive

• It is autosomal recessive

• It is autosomal dominant

What is required for an autosomal recessive trait to appear?

• Two recessive genes, one from each parent

• One dominant gene from either parent

• Two dominant genes, one from each parent

• One recessive gene from either parent

Why do X-linked traits often appear more in boys than girls?

• Boys have two X chromosomes

• Girls have only one X chromosome

• Girls have more dominant genes

• Boys have only one X chromosome

What is an example of an X-linked recessive trait?

• Color blindness

• Freckles

• Height

• Eye color

In X-linked dominant traits, who is more likely to show the trait?

• Neither boys nor girls

• Both boys and girls equally

• Only boys

• Only girls