What is a Chromosome?

And other related questions

Chromosomes

• Threadlike structures or granular chromatin during interphase

• In nucleus• Carry DNA• Form for mitosis• Displayed as a

karyotype

Gene• Part of chromosome

that controls the inherited traits

• One part of DNA• Located on a

certain place of the chromosome

• 1 gene = 1 trait• May work together• Also control

chemical processes of life

Chromosome Pairs

• Occur in pairs• One version from

each parent• One version of each

gene from each• 23 pair in humans• Usually similar in

size, shape, and genes (homologous)

All these have 23 pair! Does chromosome # determine species?

Privvy = Privet (privacy)

Alleles

• Different versions of same gene

• Usually found at same location on the same chromosome

• At least 2; sometimes several

Examples of Gene Alleles

• Eye color – blue or brown groups

• Then divided:• Blue = blue, green,

gray• Brown = gold,

brown, black• Amount of melanin

Examples of Gene Alleles

• Flower color• Two or many

Examples of Gene Alleles

• Seed coat• Just two

Others

Others