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12 Dec 2019

A) predict the trc for th folowing genotypes AABBCCDD, AcbbccDd, AaBBCcDD, aaBbCCDd for males and females when the active allele is 12 for males and 9 for females. aabbccdd females produce baseline of 70 and males aabbccdd baseline of 80

B) write the genotypes of parents who are heterozygous for all four genes.

C) write the genotypes of their child who has the maximum number of active alleles possible.

D) what are the TRCs for the parents and their child ( assume that the child is a male)?

e) calculate the probability that these parents would produce a child with the minimum number of active alleles.

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13 Dec 2019
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Related questions

In rats, the following genotypes of two independently assorting autosomal genes determine coat color as follows: A-B- (gray), A-bb (yellow), aaB- (black), aabb (cream). A third gene pair on a separate autosome determines whether or not any color will be produced. DD and Dd genotypes allow color according to the expression of the A and B alleles. However, the dd genotype results in albino rats regardless of alleles of the A and B alleles present. Determine the phenotypic ratios of the offspring from the following crosses: (3 points)

AAbbDD x aaBBdd

AaBBDD x AABbdd

AaBbDd x AaBbDd

Using the information on coat color in rats from the previous problem, determine the genotypes and phenotypes of the parents who produced the following offspring: (2 points)

3/8 black
3/8 cream
2/8 albino

In a family of five children, what is the probability (expressed as a reduced fraction) that: (4 points)

All are males?

Three are males and two are females?

One is male and four are females

The next child will be female?

A cross is made between two true-breeding strains (P1generation) in Drosophila. The

following F2 data were obtained by intercrossing the F1 malesand females from this cross:

Phenotype # of flies

Claret eyes, wildtype bristles 255

Red eyes, frizzled bristles 248

Red eyes, wildtype bristles 497

Claret eyes, frizzled bristles 0

a) What were the phenotypes of the F1 males and F1 females thatwere crossed to produce the

F2 generation?

b) What were the genotypes of the F1 males and F1 females thatwere crossed to produce the F2

generation?

c) Explain whether a student can conclude that claret eyes aredetermined by a recessive allele of

an autosomal gene.

d) Can the student conclude that the 2 genes are syntenic (onthe same chromosome)? Explain.

e) Indicate the genotypes of the gametes that will be producedby the F1 males and females.

f) Illustrate, using appropriate symbols and convention, thegenotypes of the two true-breeding

parents of the F1 generation.

g) Predict the expected number of male and female flies in eachof the 4 phenotypes in a

population of 2000 flies, if the F1 male is crossed to a femalefrom a tester strain with claret

eyes and frizzled bristles.


You are given 4 true-breeding mutant strains of fruit flies, each with a different eye colour
phenotype (apricot, orange, brown & scarlet). Specific reciprocal crosses between the recessive
mutant strains produced the following results in the F1 generations:
P1: apricot female x orange male F1 : apricot males and orange females
P1: orange female x apricot male F1 : orange males and females
P1: brown female x scarlet male F1 : wildtype males and females
P1: scarlet female x brown male F1 : wildtype males and females

i) Are the four mutant phenotypes all controlled by different alleles of a single gene? Explain.

ii) Which of the mutant phenotypes, if any, are due to allelic mutations?

iii) Which of the mutant phenotypes, if any, are due to alleles of autosomal genes? Explain.

iv) Using your own symbols for the mutations, indicate the genotypes of the F1 generation males
and females in each of the crosses.

v) Which of the F1 generations when intercrossed are likely to yield recombinant phenotypes in
the F2 generations? Explain showing the expected phenotypes and their proportions. (You
may assume that Mendel’s 2nd Law of Heredity holds true for the mutations involved in this
situation. Further assume that the double mutant results in a white eye color).

vi) Predict the outcome in the F1 generations of a reciprocal cross between a truebreeding strain
with brown eyes and another with apricot eyes.

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