Mendelian Genetics Concepts

The video continues the discussion on Mendelian genetics, focusing on inheritance patterns and genetic prediction using Punnett squares. It explains the concepts of homozygous and heterozygous alleles, and how dominant and recessive traits are expressed. The video covers monohybrid and dihybrid crosses, illustrating Mendel's laws of inheritance, including the law of independent assortment. The video concludes with a preview of future topics on chromosomal inheritance.

What is the term for different versions of a gene?

• Alleles

• Phenotypes

• Genotypes

• Chromosomes

In Mendelian genetics, what happens when a dominant allele is present?

• It becomes recessive

• It disappears

• It is expressed over the recessive allele

• It is masked by the recessive allele

What tool is used to predict the genetic makeup of offspring?

• Chromosome chart

• Punnett square

• Genetic map

• Gene sequence

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

• It has three alleles

• It has two different alleles

• It has two identical alleles

• It has no alleles

What is the phenotype of a homozygous dominant genotype in pea plants?

• Yellow peas

• Green peas

• Purple flowers

• White flowers

What is the expected phenotypic ratio from a monohybrid cross of two heterozygous individuals?

• 2:2

• 1:1

• 3:1

• 9:3:3:1

What is the result of crossing two heterozygous pea plants in a monohybrid cross?

• All offspring are heterozygous

• A 3:1 ratio of dominant to recessive phenotypes

• All offspring are homozygous

• A 1:1 ratio of dominant to recessive phenotypes

What does Mendel's law of independent assortment state?

• Alleles segregate together

• Alleles are always dominant

• Alleles segregate independently

• Alleles do not segregate

What phenotypic ratio is expected from a dihybrid cross?

• 2:2

• 1:1

• 9:3:3:1

• 3:1

In a dihybrid cross, what combination of traits did Mendel observe that was unexpected?

• No traits

• Combinations of dominant and recessive traits

• Only recessive traits

• Only dominant traits