Homozygous

In genetics, the term "homozygous" refers to an organism that has two identical alleles for a particular trait. Alleles are different forms of a gene that can cause different variations of a trait. An organism can be homozygous dominant (having two dominant alleles) or homozygous recessive (having two recessive alleles).

Types of Homozygous:

Homozygous Dominant (BB): This means that both alleles for a particular gene are the dominant form. For example, if the gene for seed shape in pea plants is denoted by "B" for round seeds (dominant) and "b" for wrinkled seeds (recessive), a pea plant with the genotype "BB" would be homozygous dominant for seed shape.
Homozygous Recessive (bb): This means that both alleles for a particular gene are the recessive form. Using the same example, a pea plant with the genotype "bb" would be homozygous recessive for seed shape.

Study Guide:

When studying homozygous traits, it's important to understand the concept of alleles and how they determine specific traits in organisms. Here are some key points to focus on when learning about homozygous traits:

Understand the difference between dominant and recessive alleles.
Learn how to determine the genotype of an organism based on its phenotype.
Practice Punnett squares to predict the outcomes of genetic crosses involving homozygous parents.
Explore real-life examples of homozygous traits in different organisms, such as coat color in cats or eye color in humans.

By mastering the concept of homozygous traits, you can gain a deeper understanding of how genetic inheritance works and how traits are passed down from one generation to the next.

◂Science Worksheets and Study Guides Eighth Grade. Chemical reactions

Vocabulary/Answer key

Chemical reactions

Vocabulary/Answer key

Chemical reactions

The resources above cover the following skills:

Chemistry: Students will use scientific skills and processes to explain the composition, structure, and interactions of matter in order to support the predictability of structure and energy transformations.

Conservation of Matter: Provide evidence to support the fact that the idea of atoms explains conservation of matter.

Cite evidence from investigations that the total mass of a system remains the same throughout a chemical reaction because the number of atoms of each element remains the same.

Give reasons to justify the statement, 'If the number of atoms stays the same no matter how the same atoms are rearranged, then their total mass stays the same.'

Physical and Chemical Changes: Provide evidence to support the fact that common substances have the ability to change into new substances.

Investigate and describe the occurrence of chemical reactions using the following evidence: Color change; Formation of a precipitate or gas; Release of heat or light.

Use evidence from observations to identify and describe factors that influence reaction rates: Change in temperature; Acidity.

Identify the reactants and products involved in a chemical reaction given a symbolic equation, a word equation, or a description of the reaction.

Provide data from investigations to support the fact that energy is transformed during chemical reactions.