Dominance: (use th yieldr an Fa gernernation that ls k(r whathappenwn toF pink b

Question

Dominance: (use th yieldr an Fa gernernation that ls k(r whathappenwn toF pink bocl ee e same base letter, but a superscript letter to define the allele) snapdragons (CW CW) when two Fi pink flowers are crossed? aJ 8. (Incomplete Dominance) When a person with tightly curled halr (HE Havwe with stralght halr (ir H), che when a person withtightdly curled hair (Hc H have children with a persor marry and have eight children. vy hair (He Hs). A couple, who both have wavy halr, ht, how many would you expect to be curly halred, how many wavy hatred, and how many stralght halred, assuming that the family follows the expected statistically predictd pattern b. Suppose you examine the actual children and discover that three of the eight have curly hair. What do you suppose went wrong? 8. In cattle C is used as a symbol for red hair and Cw is the symbol for white hair. A cow that is CPCW Is called a roan, where both the red hair an a. When phenotype of the offspring? d white hair are present, but they are well mixed together a homozygous red male Is mated with a homozygous white female, what is the genotype and Yoan couS S0Y 50, b. When a roan male is mated with a white female, what type of offspring do you get both genotypically and phenotypically. Use a Punnett Square to discover or confirm your results. Codominance-Blood Groups There are three different alleles determining blood groups; ? for the A antigen/s for the B antigen, and 1 for no antigen, for blood group O Blood types use the base letter l or 1 ? and are codominant, while i is recessive.

Explanation / Answer

(7)

Answer:

CRCR x CWCW

= CRCW

CR

CW

CR

CRCR (red)

CRCW (pink)

CW

CRCW (pink)

CWCW (white)

Phenotypic ratio of 1:2:1

1 red

2 pink

1 white

(8)

HC

HS

HC

HCHC (curly hair)

HCHS (wavy hair)

HS

HCHS (wavy hair)

HSHS (straight hair)

Expected phenotypic ratio will be 1:2:1 (Curly hair : wavy hair : straight hair)

(a)If the family has 8 children, among them we expect 2 Curly hair : 4 wavy hair : 2 straight hair children.

(b)

If the three of the children are of curly hair, it doesn’t mean that the trait follows a different genetics other than incomplete dominance. It means we would need more number of similar crosses to assess if this is completely incomplete dominant.

CR

CW

CR

CRCR (red)

CRCW (pink)

CW

CRCW (pink)

CWCW (white)

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