Mendelian Genetics and Traits

The video tutorial introduces Mendelian genetics, named after Gregor Mendel, and explains the basic concepts of dominant and recessive traits using guinea pigs as examples. It covers genetic crosses, including heterozygous and homozygous pairings, and demonstrates how to use Punnett squares to predict offspring genotypes and phenotypes. The tutorial also explores genetic traits in Holstein cattle and pea plants, emphasizing the simplicity of Mendelian genetics compared to real-life genetics.

Who is Mendelian genetics named after?

• Gregor Mendel

• Charles Darwin

• James Watson

• Francis Crick

In guinea pigs, what is the dominant coat color?

• Spotted

• Brown

• Black

• White

What is the genotype of a homozygous black guinea pig?

• Big B Little B

• Big B Big B

• Little b Little b

• Big B Little b

What percentage of offspring will be black when a heterozygous black pig is crossed with a homozygous black pig?

• 50%

• 25%

• 75%

• 100%

If a black guinea pig and a white guinea pig produce 50% black and 50% white offspring, what is the genotype of the black parent?

• Big B Big B

• Little b Little b

• Big B Little b

• Big B Big B or Big B Little b

In Holstein cattle, what is the dominant trait for coat color?

• Solid

• Dotted

• Spotted

• Striped

What is the genotype of a spotted Holstein cow?

• Big S Big S

• Big S Little s

• Big S Big S or Big S Little s

• Little s Little s

In peas, what is the dominant trait for stem length?

• Medium stem

• Curly stem

• Short stem

• Long stem

What is the expected genotype of offspring from a cross between a homozygous long-stemmed pea plant and a short-stemmed pea plant?

• Big A Big A

• Big A Little a

• Little a Little a

• Big A Big A or Big A Little a

What percentage of offspring will be long-stemmed when a heterozygous long-stemmed pea plant is crossed with a homozygous long-stemmed pea plant?

• 100%

• 75%

• 50%

• 25%