8LS3 Ch 5 Genetics Test

What is a trait?

• Both parents are heterozygous (Nn), and the calf received two recessive alleles (nn).
• A characteristic or feature of an organism, like eye color or height.
• A male that shows the trait.
• 25% RR (red), 50% RW (red and white), 25% WW (white). This is due to codominance, where both alleles are expressed in the heterozygous (RW) condition.

What do we call the molecule that stores genetic information?

• DNA (Deoxyribonucleic Acid).
• Black fur.
• It means having two different alleles for a trait (Example: Bb).
• Both parents are heterozygous (Hh). The 3:1 ratio is typical of a Hh × Hh cross: 25% HH, 50% Hh (green), and 25% hh (brown).

Which type of trait shows up only when both alleles are recessive?

• Recessive trait.
• Both parents are carriers of the recessive allele. Each parent can pass on the recessive allele, and if the child inherits both recessive alleles (hh), the trait will be expressed.
• Both parents are heterozygous (Hh). The 3:1 ratio is typical of a Hh × Hh cross: 25% HH, 50% Hh (green), and 25% hh (brown).
• Incomplete dominance.

What do we call the different versions of a gene?

• 25% RR (red), 50% RW (red and white), 25% WW (white). This is due to codominance, where both alleles are expressed in the heterozygous (RW) condition.
• Alleles.
• Recessive trait.
• Incomplete dominance.

Which term describes the physical traits we can see?

• Alleles.
• Both parents are heterozygous (Nn), and the calf received two recessive alleles (nn).
• Both parents are carriers of the recessive allele. Each parent can pass on the recessive allele, and if the child inherits both recessive alleles (hh), the trait will be expressed.
• Phenotype.

What does 'heterozygous' mean?

• Both parents are heterozygous (Hh). The 3:1 ratio is typical of a Hh × Hh cross: 25% HH, 50% Hh (green), and 25% hh (brown).
• Phenotype.
• It means having two different alleles for a trait (Example: Bb).
• Both parents are carriers of the recessive allele. Each parent can pass on the recessive allele, and if the child inherits both recessive alleles (hh), the trait will be expressed.

What are the possible genotypes of the offspring from two heterozygous parents (Rr × Rr)?

• DNA (Deoxyribonucleic Acid).
• Recessive trait.
• A male that shows the trait.
• RR, Rr, Rr, rr – 25% RR, 50% Rr, 25% rr.

A guinea pig has the genotype Bb. What fur color will it most likely have if black is dominant and brown is recessive?

• Phenotype.
• Both parents are heterozygous (Nn), and the calf received two recessive alleles (nn).
• Recessive trait.
• Black fur.

In a pedigree, what does a shaded square typically represent?

• A male that shows the trait.
• Phenotype.
• Both parents are carriers of the recessive allele. Each parent can pass on the recessive allele, and if the child inherits both recessive alleles (hh), the trait will be expressed.
• Black fur.

Why can two parents without horns in cattle have a calf with horns?

• Both parents are heterozygous (Nn), and the calf received two recessive alleles (nn).
• RR, Rr, Rr, rr – 25% RR, 50% Rr, 25% rr.
• Phenotype.
• 50%. The Punnett square shows Ff × ff = 50% Ff (fuzzy), 50% ff (smooth-skinned).