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Answer the next five questions based on the following information. You are studying a particular type of spider and have identified four traits that follow simple mendelian genetics. The B gene governs body color and black body color is dominant to brown. The D gene governs whether or not the spider is poisonous, and poisonous is dominant to non-poisonous. The E gene governs eye color and black eyes are dominant to red eyes. The H gene governs hair type and hairy is dominant to hairless. Indicate your answer numerically not alphabetically. For instance, answer "2" not "two." For each answer that is not a whole number, give your answer as a fraction reduced to the lowest possible whole numbers. For instance, 3/9 would be reduced to 1/3.

How many different types of gametes can be formed by a spider that has the genotype BbDdEeHH?


If you chose a single gamete at random from a spider that has the genotype BbDdEeHh, what is the probability that the gamete would have the genotype BdEh?

You mate a BbDDEeHh spider with a BbDdEEHh spider. What is the probability that one randomly chosen offspring will have the genotype BbDdEEHH?

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Bunny Greenfelder
Bunny GreenfelderLv2
28 Sep 2019

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Related questions

In fruit flies, the gene for eye color is sex-linked (X-chromosome)and red eye color is dominant over white. The gene for body coloris an autosomal trait with gray dominant over black. A heterozygousred-eyed, pure-bred gray female mates with a heterozygous gray malewho has red eyes. What is the probability that any of the offspringproduced have he following traits? You must show your work (i.e.Punnett squares) to get credit.

a. Red eyes
b. gray body
c. white eyed female
d. white eyes and heterozygous gray body
e. female and red eyed gray body

1. In humans, blood types A and B are codominant to each otherand each is dominant to O. What blood types are possible among theoffspring of a couple of blood types AB and A?

Select one:

a. A and B only

b. A, B, and O only

c. A and AB only

d. A, B, AB, and O

e. A, B, and AB only

2. You are studying body color in an African spider and havefound that it is controlled by a single gene with four alleles: B(brown), br (red), bg (green), and by (yellow). B is dominant toall the other alleles, and by is recessive to all the otheralleles. The bg allele is dominant to by but recessive to br. Youcross a pure-breeding brown spider with a pure-breeding greenspider. Predict the genotype of the progeny.

Select one:

a. B/by

b. Br/bg

c. br/by

d. B/bg

e. by/bg

3. A mother of blood type A gives birth to a child with bloodtype O. Which of the following could NOT be the blood type of thefather? Select one:

a. A

b. Any type is a possible blood type of the father

c. AB

d. B

e. O

4. Crossing two yellow mice results in 2/3 yellow offspring and1/3 nonyellow offspring. What percentage of offspring would youexpect to be nonyellow if you crossed two nonyellow mice? Selectone:

a. 100%

b. 33%

c. 75%

d. 25%

e. 66%

5. Coat color is determined by two loci in large cats. Two pinkpanthers fall in love and produce a large litter of baby pantherswith the following phenotypic ratios: 12/16 pink; 3/16 black; and1/16 whitE. What is the genotype of the pink progeny?

Select one:

a. A_ bb

b. aa bb

c. aa B_

d. A_ B_ and A_ bb

e. A_ B_

Problem A. You cross two homozygous parents: RRYY (round yellow) and rryy (wrinkled green) to produce an F1 generation. Round seeds are dominant, yellow seeds are dominant. You cross two F1s to produce the F2 generation. In the F2 generation, you find an individual with round yellow seeds. You do a testcross to find out the genotype of this “mystery” dominant/dominant phenotype. In the offspring of the cross, you find 1?2 have round yellow seeds and 1?2 have wrinkled yellow seeds.
1. Based on these data what was the genotype of the mystery F2?

Problem B. You carry out a dihybrid cross between a red-flowered rose with long pollen grains (A1A1 LL) and a white-flowered rose with round pollen (A2A2 l l). The flower color gene (A) shows incomplete dominance, and long pollen is completely dominant to round pollen. The genes for these traits are on different chromosomes so assort independently
2. What would be the phenotypes of the F1 generation?
3. What fraction of the F2 generation is expected to have red flowers and long pollen? (As always when traits are independent, what rule can you apply to save time?)

Problem D. In the example of epistasis presented in class, the agouti allele in mice (A) codes for striped hairs and is dominant to the allele for all black hairs (a). A loss-of-function allele for the pigment gene (b) produces no pigment and is recessive to the normal, dominant allele (B). The recessive allele at b masks the effect of the A gene. A dihybrid cross of AABB and aabb is carried out.
5. Name all of the genotypes in the F2 generation that can produce an albino (no pigment) phenotype.

Problem E. A cross is made between homozygous fruit flies that differ for eye color (the st gene) and
body color (the e gene). The F1 double heterozygote is shown below using chromosome notation.
st+ e
--------------------------------------
st e+
st = the recessive allele for scarlet eyes; st+ = the dominant wildtype allele for red eyes e = the recessive allele for ebony body; e+ is the dominant wildtype allele for gray body

6. Are the chromosomes shown in the genotype above in cis or trans configuration?
7. Based on this notation, what were the genotypes and phenotypes of the two parents of the F1? (Think carefully here...)
8. With what phenotype would you cross this F1 to measure recombination frequency?

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