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For the following crosses, indicate the probability of obtaining the indicated genotype in an offspring. Remember, it is easiest to treat each gene separately as a monohybrid cross and then combine the probabilities. Please enter your answer as a proportion.

Cross: AABb × AaBb

Offspring: Aabb

Cross: AaBb × AaBb

Offspring: aaBB

Cross: AABbcc × aabbCC

Offspring: AaBbCc

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Beverley Smith
Beverley SmithLv2
28 Sep 2019

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Related questions

You have four pure-breeding strains of mice that all have white fur. Crosses between brown females from a wild-type strain and white males from your four strains produce only brown progeny, indicating that all four strains carry a recessive mutation that causes white fur. You cross all of the white strains to each other as indicated in the table below, and record the fur color of the offspring.

Mother strain Father strain Progeny

Cross #1 A B brown

Cross #2 A C brown

Cross #3 A D white

Cross #4 C B white

Cross #5 D B brown

Cross #6 D C brown

Cross #7 B A brown females, white males

Cross #8 C A brown females, white males

Cross #9 D A white

Cross #10 B C white

Cross #11 B D brown females, white males

Cross #12 C D brown females, white males

Complete the following table of progeny genotypes from the crosses listed above. You will need as many loci (columns) as there are number of different genes carrying white-fur mutations (this may be more or fewer than three loci). In each row indicate the genotype of the progeny of that cross at all loci. Denote white-fur alleles with w and brown-fur alleles with +. If there are loci where the genotype differs between males and females, list both genotypes and indicate which genotype belongs to each sex.

Cross # locus1 locus2 locus3 ....

1 + +

2

3

4

5

6

7

8

9

10

11

12

In a few sentences, describe why some crosses produce all brown offspring, some crosses produce all white offspring, and some produce brown and white offspring. Use the following terms in your answer: complement, fail to complement, X-linked, autosomal.

Please assist with the following. Please no hand-written work, but typed work and thorough explanations please including Punnett Squares. Please Ignore Sex, as these are not sex-linked traits

Dihybrid Testcrosses

In the following crosses, the wild trait is dominant and the brown trait for eye color and ebony trait for body color are both recessive. You will compare the offspring of homozygous wild flies to the offspring of heterozygous wild flies, when each is crossed with a recessive brown-eyed fly with an ebony body.

7. Perform a monohybrid cross between a wild-type female fly and a male fly with brown eyes and ebony body.
Show results for the F1 offspring. (NOTE: You will use one of these F1 flies in the next cross.)
ENTER DATA HERE:

PUNNETT SQUARE:

List the genotypes of the flies in this cross:

List the gametes produced by each fly in this cross:

Show the Punnett Square for the above cross.

Question: By examining the offspring, determine whether the wild-type female parent was homozygous or heterozygous for eye color and body color. How did you arrive at this conclusion?

Question: Are the F1 offspring homozygous or heterozygous for eye color and body color? How did you arrive at this conclusion?

8. Now perform a cross between one wild-type F1 offspring from the previous cross and a male fly with brown eyes and ebony body.
ENTER DATA HERE:

PUNNETT SQUARE:

List the genotypes of the flies in this cross:

List the gametes produced by each fly in this cross:

Show the Punnett Square for the above cross.

Question: Even though you already knew the genotype of the wild-type fly used in this cross, how can you tell by examining the offspring of this cross whether the wild-type fly in this cross was homozygous or heterozygous for eye color?

Question: What was the phenotypic ratio for the offspring resulting from this testcross?

Short answers please

1. What is the ultimate effect in an XY human with its SRY genemutated?


2. In humans, the allele for brown eye (B) is dominant to blue(b) eye color. If two heterozygous parents produce children, whatis the probability that:

a. The first child has brown eyes, and the next two childrenhave blue eyes?

b. If the couple above eventually produces a total of sixchildren, what is the probability that three of them will be boyswith brown eyes, and three of them girls with blue eyes?


3. In a paternity dispute, a type AB woman claimed that one ofthe four men was the father of her type A child. Which of thefollowing men could be the father of the child on the basis of theevidence below? Give your reasoning.

Man #1 = type A

Man #2 = type B

Man #3 = type O

Man #4 = type AB


4. Several mating were made among all-white cats. The progentfrom these mating showed the following phenotypic frequency:

All-white cats = 12/16

Black cats = 3/16

Gray cats = 1/16

a. Diagram the cross showing the genotypes of the parents, andtheir progeny as given above,

b. Which gene is epistatic? Explain your answer.


5. Mitosis and meiosis differ in that

a. homologues are seperated in prophase of mitosis

b. homologues are seperated in prophase I of meiosis

c. homologues are seperated in prophase II of meiosis

d. sister chromatids are seperated in prophase I of meiosis


6. The phases of meiosis that most resemble those of mitosisare

a. the meiosis I phase

b. the meiosis II phase

c. meiosis I, except for the pairing of homologues

d. meiosis II, except for the pairing of homologues


7. Genetic variability in sexually reproducing organism s arisesfrom

a. crossing over events between sister chromatids

b. crossing over events between nonsister chromatids

c. egg and sperm genetic recombination from distinctindividuals

d. egg and sperm recombination from an individual


8. A female contains an extra X chromosome, resulting fromnondisjunction. When this gamete is fertilized with normal sperm,it would result in an individual of a genotype

a. XXX

b. XXY

c. XYY

d. all of the above

e. only a and b


9. A diploid organism has the genotype AaBbCcDdEe. How manydifferent types of gametes can this individual produce?

a. 5

b. 10

c. 25

d. 32

e. 625


10. Assuming complete dominance, what is the phenotype ratio ofthe offspring of the cross AaBb x aabb?

a. 1:1

b. 3:1

c. 1:2:1

d. 1:1:1:1

e. 9:3:3:1

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