iS. (3 POINTS) n snapdragons, red is completely dominant trait over white, which

Question

iS. (3 POINTS) n snapdragons, red is completely dominant trait over white, which recessive Lang dominant over short petals. Perform a dihybrid cross between two heterozygous snapdragon petals is also plants, Show your Punnett scuare (2 points) and give the phenotypic ratio of offspring result from this cross (1 point). 16. (2 POINTS) In humans, the gene for normal color vision (C) is dominant to the gene for red-green cefor blindness. This trait is X-linked. Draw a Punnett square that would result from a normal vision male mating with a color blind woman (1 point). What are the chances of a boy with normal ision resulting from these two parents (1 point)?

Explanation / Answer

(15)

Answer:

R=Red

r=white

W=long flower

w=short flower

Dihybrid cross

RrWw x RrWw

RW

Rw

rW

rw

RW

RRWW

RRWw

RrWW

RrWw

Rw

RRWw

RRww

RrWw

Rrww

rW

RrWW

RrWw

rrWW

rrWw

rw

RrWw

Rrww

rrWw

rrww

9 Red, long flower

3 Red, short flower

3 white, long flower

1 white, short flower

(16)

Normal vision= XC

Red green color blindness=Xc

Normal vision man (XCY) x color blind woman (XcXc)

XC

Y

Xc

XCXc

XcY

All female children are carriers of red green allele, but have normal vision

All male children will suffer from red green color blindness

Chances of a Boy with normal color vision is zero

RW

Rw

rW

rw

RW

RRWW

RRWw

RrWW

RrWw

Rw

RRWw

RRww

RrWw

Rrww

rW

RrWW

RrWw

rrWW

rrWw

rw

RrWw

Rrww

rrWw

rrww

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