Unit 5 concept 2

Question 1

Chromosome Theory of Inheritance

Answer 1

Since genes are located on chromosomes, how the
chromosomes behave during meiosis will determine inheritance patterns

Question 2

Epistasis

Answer 2

When one gene overshadows all others

Question 3

Carrier

Answer 3

Someone who carries a recessive allele but doesn’t show
the trait due to having a dominant allele to mask over it

Question 4

Explain the difference between incomplete dominance
and codominance. Give examples of each.

Answer 4

• Incomplete dominance: heterozygous genotype yields a phenotype that is a blend of the other two traits. Neither allele is completely dominant or reccesive
• Codominance: heterozygous genotype yields a phenotype that shows both of the other traits fully and separately.
• Ex. In incomplete dominance, red and white flowers would
  make pink flowers. In codominance, red and white flowers
  would make red and white speckled flowers.

Question 5

Explain the difference between multiple alleles and
polygenic traits. Give examples of each.

Answer 5

• Multiple alleles: more than 2 versions of 1 gene.
• Polygenic inheritance: a trait produced by two or more genes think RANGE
• Ex. Blood type has alleles A, B, and i that determine the gene
  (multiple alleles) whereas skin color, height is determined by thousands of genes (polygenic inheritance).

Question 6

Explain how blood type is an example of both
codominance and multiple alleles.

Answer 6

Blood type is an example of codominance because the AB
blood type is fully A and fully B.
* It is an example of multiple alleles because it has 3 alleles
to determine the genotype = A, B, i.

Question 7

Explain the difference between linked genes and
sex-linked traits. Give examples of each.

Answer 7

• Linked genes: genes that are physically located close together on the same chromosome are often inherited together (Ex. Red hair and freckles).
• Sex-linked traits: genes for traits located on sex
  chromosomes;
  if on the X (most likely), males only get 1 copy and females get 2 (Ex. Colorblindness).
  CGLOFTS

Question 8

Explain the difference between traits inherited on
sex chromosomes and traits inherited on
autosomes.

Answer 8

traits inherited sex chromosomes are more likely to affect men because they only need one affected x while women inherit them like normal autosome
traits inherited on autosomes have are equally likely yo occur in males and females

Question 9

Colorblindness is a sex linked recessive trait so do you used dashes or letters?
what are dashes for? incomplete dominence

Answer 9

letter