Spring Semester Test Biology

 What biological concept was Mendel studying when he crossed pea plants many times over many generations?

• Imbalance in the ecosystem

• Predator-prey relationship

• Dominant and Recessive traits.

• Male and Female genetic differences.

 Brown hair and brown eyes are dominant traits in humans. If both parents have brown hair and brown eyes, how is it possible that their children can have blonde hair and blue eyes?

• Both parents are homozygous for brown eyes

• Both parents are homozygous for blond hair.

• The children inherited one recessive gene from each parent.

• The children inherited one dominant gene from each parent.

Allele A is dominant in mice and allele a is recessive. Two mice with the gene combination Aa breed and produce four offspring.

Which offspring has the recessive phenotype?

• 1

• 3

• 4

• 2

 What is the correct phenotype ratio, dominant to recessive in the chart below?

• 2:1
• 2:2

• 1:2:1

• 3:1

In human beings, which factor determines the sex of an individual?

• The number of chromosomes

• Pairing with the X chromosome from the mother either with an X or Y.

• Genes within the chromosomes

• Presence of the Y chromosome

 Over several years, a scientist successfully isolates a species of flower for white color. This year, when the new generation of flowers blooms, one yellow flower is found in the population. Which is the BEST reason for the appearance of a new flower color within the species?

• Adaptation

• Genetic Mutation

• Homologous Recombination

• Replicaiton

What type of cell passes on mutations?

• Skin Cell

• Nerve Cell

• Red Blood Cell

• Egg Cell

 An error in gamete formation results in a zygote with an XXY chromosome combination. Which characteristic of an individual is affected by this combination?

• Cellular Respiration

• Gender-linked traits

• Muscle protein structure

• Nervous system formation

If a plant is homozygous for the dominant trait tall, what would its alleles be?

• tt

• Tt

• TT

• none of these

The physical (observable) traits a person has is their

• Genotype

• Phenotype

• Chromosomes

• Genetic Makeup