7th Grade Genetics Pre-Assessment

Front

How many females are in a pedigree if the answer is 7?

Back

In a pedigree, the number of females is counted by identifying the circles, which represent females. In this case, there are 7 females.

Front

What does 'aa' always show up as?

Back

The genotype 'aa' always shows up as recessive.

Front

What is the term for the physical appearance of an organism?

Back

Phenotype: The physical appearance or visible traits of an organism.

Front

In a flowering plant species, if red flower color (R) is dominant over white flower color (r), what are the possible genotypes for a red-flowering plant?

Back

The possible genotypes for a red-flowering plant are RR (homozygous dominant) or Rr (heterozygous).

Front

How many generations are shown in a pedigree if the answer is 4?

Back

A pedigree can show multiple generations, and in this case, it shows 4 generations.

Front

What is a genotype?

Back

Genotype: The genetic makeup of an organism, represented by the alleles it possesses.

Front

What is the difference between dominant and recessive traits?

Back

Dominant traits are expressed in the phenotype even if only one allele is present, while recessive traits are expressed only when two recessive alleles are present.

Front

What does homozygous mean?

Back

Homozygous: Having two identical alleles for a particular gene (e.g., AA or aa).

Front

What does heterozygous mean?

Back

Heterozygous: Having two different alleles for a particular gene (e.g., Aa).

Front

What is a pedigree chart?

Back

A pedigree chart is a diagram that shows the occurrence and appearance of phenotypes of a particular gene or organism across generations.