The duck \"billed Parasaurolophus has a huge crest through which its nasal passa

Question

The duck "billed Parasaurolophus has a huge crest through which its nasal passages run. cal it ,apparatus is used to produce loud calls. You find that the animals produce two kinds of calls and hoots and whistles. A single gene controls sound and hooting (H) is dominant to whistling dU a,S degrees find that the crests come in bri9ht colors. Color is controlled by a single gene and due () is dominant to red The two queens are on different chromosomes and so they assort independently. Let s say you have a pure-breeding Blue Hooter and a pure-breeding Red Whistler. Give the genotypes of these animals. Show the types of gametes they would produce. If you were to cross these animals, give the genotype and phenotype found in the Fi. Show the types of gametes that the Ft animals could produce. If you were to cross two members of the F-i with each other, what phenotypes could occur in the F2? What would be the proportions of the different phenotypes in the F2? Ok - we'll move out of Jurassic Park now for some more practice. . . In smileys, the shape of the eye is controlled by multiple alleles. The smileys pictured show the four possible phenotypes. It is known that the star and dot eyes are codominant and the square eyes are a recessive trait.

Explanation / Answer

5. When it is an independent assortment, it (F1) would have heterozygous progeny from above-mentioned parents,

a. BBHH (Blue Hooter) X bbhh (Red Whistler)-----------> pure parents (Homozygous)

b. BH X bh (gametes)

c. BbHh---------> F1 (Blue Hooter in heterozygous state)

d. BH Bh bH bh ---------------> F2

BH BBHH BBHh BbHH BbHh   

Bh BBHh BBhh BbHh Bbhh   

bH BbHH BbHh bbHH bbHh

bh BbHh Bbhh bbHh bbhh

Phenotypic ratio 9:3:3:1 (Blue Hooter : Blue Whistler : Red Hooter : Red Whistler)

6a. SESE (Star eye), DEDE (Dot eye), SEDE (Star and dot eye), SeDe (Square eye)

b. SESE X DEDE(Homozygous)

SEDE ------->F1 is star and dot eyes

c. SESe x DEDe (Heterozygous)

SEDE : SEDe : SeDE :SeDe (Star & dot eye (1): Star eye (1):, Dot eye (1):, Square eye (1))

d.  SEDE x SeDe

   SESe SEDe :DESe   DEDe (Star eye 2: 2 Dot eye)

7. It seems it is codominance.

CRCR x CW CW (Red cow x White cow)

  CR   CW

CR   CRCR CRCW

CW CRCW CWCW

Here,red and white are two dominant traits when they crossed with each other they could produce intermediate phenotype roan (CRCW). Red: Roan: White (1:2:1), like that they are produced by 2 alleles.

b. No, he cannot produce red with his stock of cows, see below what he has

CRCW x   CWCW

CRCW CRCW   CWCW   CWCW (only roan and white)

  

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