Genetics Concepts and Terminology

This video introduces genetic crosses, explaining key terms like genes, chromosomes, alleles, and the concepts of dominance and recessiveness. It covers the definitions of genotype and phenotype, and illustrates these concepts with examples, including a detailed genetic cross using pea plants. The video emphasizes the importance of understanding these terms for solving genetic problems.

What is the primary function of a gene?

• To transport nutrients

• To store energy

• To protect the cell

• To code for a protein

Where are genes located within a cell?

• In the ribosomes

• On chromosomes

• On the cell membrane

• In the cytoplasm

What determines if an allele is dominant or recessive?

• Its position on the chromosome

• Its ability to mask another allele

• The number of chromosomes

• The trait it codes for

In the context of genetics, what does the term 'phenotype' refer to?

• The location of a gene on a chromosome

• The physical appearance of an organism

• The genetic makeup of an organism

• The number of chromosomes

What is the genotype of an individual with one dominant and one recessive allele?

• Homozygous dominant

• Monohybrid

• Homozygous recessive

• Heterozygous

What does it mean if an organism is homozygous for a trait?

• It has two different alleles for a trait

• It has two identical alleles for a trait

• It has no alleles for a trait

• It has more than two alleles for a trait

In a genetic cross, what does a Punnett square help predict?

• The number of chromosomes in offspring

• The genetic makeup of the parents

• The lifespan of an organism

• The possible genotypes of offspring

If a pea plant has a genotype of 'Gg', what is its phenotype if green is dominant?

• Blue pod

• Green pod

• Red pod

• Yellow pod

What is the expected phenotype ratio of offspring from two heterozygous pea plants (Gg x Gg) for pod color?

• 4 green: 0 yellow

• 2 green: 2 yellow

• 3 green: 1 yellow

• 1 green: 3 yellow

What is the genotype of a pea plant with yellow pods if green is dominant?

• Gg

• gg

• GG

• Gg or gg