I\'m trying to study for an exam tomorrow, and I have this study guide. I am uns

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I'm trying to study for an exam tomorrow, and I have this study guide. I am unsure if my answers are correct or not, and I have nothing to compare it to. Could someone please put their responses in so I can compare? This is not a graded assignment, it's simply for individual study. Thanks!

GENETICS PROBLEMS In peas, yellow color is dominant to green color. What will be the colors and proportions of the offspring from the following crosses? 1. a. homozygous yellow X green b. heterozygous yellow X green c. heterozygous yellow X homozygous yellow d. heterozygous yellow X heterozygous yellow 2. Black fur color and short hair are dominant traits in guinea pigs. What are the expected phenotypes and proportions of offspring produced by a cross between a guinea pig heterozygous for both black coat color and short hair and a white, long haired guinea pig? 3. Two long-winged flies were mated. The offspring consisted of 77 with long wings and 24 with short wings. Is the short-winged condition dominant or recessive? What are the genotypes of the parents? 4. The ability to roll the tongue into almost a complete circle is conferred by a dominant allele, while the recessive allele fails to confer this ability. A man and his wife can both roll their tongues and are surprised to find that their son cannot. Explain this by showing the genotypes of all three persons 5. If two fruit flies, heterozygous for one pair of alleles, were bred together and had 200 offspring, about how many would have the dominant phenotype? Of these, some will be homozygous dominant and some will be heterozygous. How is it possible to establish which is which? 6. In web-footed flapnobs, bodies are either long, round, or oval. In order to understand the inheritance of body shape in this rare species you carry out the three crosses described below a. long X oval 52 long and 48 oval offspring b. long X round99 oval offspring c. oval X oval 24 long, 53 oval, and 27 round offspring Using the data above, explain the inheritance of body shape in flapnobs 7. In rabbits, spotted coat (A) is dominant to solid color (a) and black fur (B) is dominant to brown (b). In a large population, brown spotted rabbits are mated to solid black ones and all of the offspring are black spotted. What are the genotypes of the parents? What would be the appearance of the F2 generation if two of these F1 black spotted rabbits were mated? Illustrate your answer with a Punnett square

Explanation / Answer

Answer:

1).

a). Homozygous yellow (YY) x green (yy)—Parents

                                         Yy (yellow)------------offspring

All are yellow

b). Heterozygoue yellow (Yy) x green (yy)------Parents

Y

Y

Yy (yellow)

y

yy (green)

Yellow (1) : green (1)

c). Heterozygoue yellow (Yy) x homozygoud yellow (YY)------Parents

Y

Y

YY (yellow)

y

Yy (yellow)

All yellow

d).

Heterozygoue yellow (Yy) x Heterozygoue yellow (Yy)---Parents

Y

y

Y

YY (yellow)

Yy (yellow)

y

Yy (yellow)

yy (green)

Yellow (3) : Green (1)

2).

Black & short (BbSs) x white & long (bbss)—Parents

bs

BS

BbSs (black, short)

Bs

Bbss (black, long)

bS

bbSs (white, short)

bs

bbss (white, long)

Black, short (1) : Black, long (1) : white, short (1) : white, long (1)

3). Short-winged condition is recessive. The genotypes of long winged parents are Ll (heterozygous).

4).

Both man and his wife are heterozygous for ability to roll. So that 1/4 th of their children would be not to roll.

Rr x Rr

R

r

R

RR (ability to roll)

Rr (ability to roll)

r

Rr (ability to roll)

rr (unable to roll)

Ability to roll (3) : unable to roll (1)

Y

Y

Yy (yellow)

y

yy (green)

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