Genetics and Inheritance Concepts

Front

What is the definition of dominant allele?

Back

A dominant allele is a variant of a gene that will express its trait in the phenotype even when only one copy is present (e.g., 'B' in Bb).

Front

What is the definition of recessive allele?

Back

A recessive allele is a variant of a gene that only expresses its trait in the phenotype when two copies are present (e.g., 'b' in bb).

Front

What is the expected phenotypic ratio of offspring from a cross between two heterozygous parents (Bb x Bb)?

Back

3 melanistic : 1 gray.

Front

What is the probability of obtaining a white flower from a cross between two heterozygous red flowers (Rr x Rr)?

Back

25%.

Front

What is the chance of a child having blue eyes if both parents are heterozygous brown-eyed (Bb x Bb)?

Back

25%.

Front

What does homozygous mean in genetics?

Back

Homozygous refers to having two identical alleles for a particular gene (e.g., BB or bb).

Front

What does heterozygous mean in genetics?

Back

Heterozygous refers to having two different alleles for a particular gene (e.g., Bb).

Front

Can a child with type O blood have a parent with type AB blood?

Back

No, a child with type O blood cannot have a parent with type AB blood.

Front

What is a Punnett square used for?

Back

A Punnett square is a diagram used to predict the genetic outcomes of a cross between two organisms.

Front

What is the definition of genotype?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it carries (e.g., BB, Bb, or bb).