Inheritance and genetic variation

What are chromosomes?

• Long strands of DNA that contain lots of genes.

• Different versions of a gene.

• The basic unit of heredity; controls a specific trait.

• A characteristic passed from parent to offspring

• The differences that occur from a mixture of genes

Tags

NGSS.HS-LS3-1

What are alleles?

• Long strands of DNA that contain lots of genes.

• Different versions of a gene.

• The basic unit of heredity; controls a specific trait.

• A characteristic passed from parent to offspring

• The differences that occur from a mixture of genes

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is a segment of DNA called?

• Chromosome
• gene
• dominant trait
• nucleus

What are the major structures in the nucleus that are made of DNA called?

• gene
• DNA
• chromosome
• mitochondria

Tags

NGSS.HS-LS3-1

An individual who has two identical alleles for a characteristic

• Carrier
• Complete dominance
• Heterozygous
• Homozygous

Tags

NGSS.HS-LS3-1

Number of chromosomes in a sex cell (gamete)

• 23
• 44
• 46
• 2

Tags

NGSS.HS-LS3-2

What can affect a person's height? 

• Genetics 
• Environmental factors 
• Parents
• Genetics and environmental factors

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What are alleles?

• different gene

• different forms of the same gene

• different proteins

• different cells

What is the definition of homozygous?

• Only one type of allele is present in the genotype, eg. BB or bb.

• Both dominant and recessive alleles are present in the genotype, eg. Bb.

• The alleles that are present, written as letters eg. BB.

• What the characteristic actually looks like eg. brown hair.

What is the definition of heterozygous?

• Only one type of allele is present in the genotype, eg. BB or bb.

• Both dominant and recessive alleles are present in the genotype, eg. Bb.

• The alleles that are present, written as letters eg. BB.

• What the characteristic actually looks like eg. brown hair.