A. A plant of genotype CCdd is crossed to ccDD. An F1 of that cross is...

A. A plant of genotype CCdd is crossed to ccDD. An F1 of that cross is testcrossed to ccdd. If the genes are unlinked, the percentage of C_D_ progeny of that cross will be _____%

B. A plant of genotype CCdd is crossed to ccDD. An F1 of that cross is testcrossed to ccdd. If the genes are so tightly linked that no recombination occurs between them, the percentage of C_D_ progeny of that cross will be _____%

Solutions

Expert Solution

Case I: When the genes are unlinked (they will follow mendels law of inheritance and will produce recombinant type other than parental types)

A test cross between CcDd (F1 ) and ccdd (double recessive parent) will produce a ratio of 1:1:1:1 as shown in the image below. Hence the percentage of Progeny C_D_ of this cross will be 25 %.

Case II: When genes are completely linked (there will be no crossing over between the genes and therefore only parental type will be formed and no recombinant type will appear.)

A test cross between CcDd (F1) and ccdd will produce a ratio of 1:1 and the progenies with C_D_ genotype will be 50 %.

Please see image

gladiator answered 1 year ago

Next > < Previous

Related Solutions

A purple flowering, smooth seed dihybrid plant (genotype PpSs) is test crossed with a white flowering,...

A purple flowering, smooth seed dihybrid plant (genotype PpSs) is test crossed with a white flowering, wrinkled seed plant (genotype ppss). These produce progeny in the following numbers of four phenotypes: 24:76:74:26 (purple flower + smooth seed coat: purple flower + wrinkled seed coat: white flower + smooth seed coat: white flower + wrinkled seed coat). a) Explain how ratios of progeny show that the two genes are linked. b) How many map units separate the colour and seed coat...

Females of genotype AaBbCc were crossed with males of genotype aabbcc.This resulted in 1000 progeny of...

Females of genotype AaBbCc were crossed with males of genotype aabbcc.This resulted in 1000 progeny of the following phenotypes: A B C 3 A B c 365 A b C 84 A b c 44 a B C 65 a B c 98 a b C 340 a b c 1 a) Calculate the distance between genes A and B. b) Calculate the distance between genes B and C. c) Calculate the observed frequency of double crossovers. d) Calculate the...

1. A pea plant with genotype TtggFFRr is test corssed. A) What is the genotype of...

1. A pea plant with genotype TtggFFRr is test corssed. A) What is the genotype of the test parent ? B) What would be the probability of offspring with genotype ttggFfrr ?

AABB and aabb individuals were crossed to each other, and the F1 generation was backcrossed to...

AABB and aabb individuals were crossed to each other, and the F1 generation was backcrossed to the aabb parent. 993 AaBb, 995 aabb, 5 Aabb, and 7 aaBb offspring resulted. a. How far apart are the a and b loci? b. What progeny and in what frequencies would you expect to result from testcrossing the F1 generation from a AAbb X aaBB crosss to aabb? c. In a typical meiosis, how many crossovers occur between genes A and B? d....

. AABB and aabb individuals were crossed to each other, and the F1 generation was backcrossed...

. AABB and aabb individuals were crossed to each other, and the F1 generation was backcrossed to the aabb parent. 850 AaBb, 950 aabb, 105 Aabb, and 95 aaBb offspring resulted. a. How far apart are the a and b loci? b. What progeny and in what frequencies would you expect to result from testcrossing the F1 generation from a AAbb x aaBB crosss to aabb? c. In a typical meiosis, how many crossovers occur between genes A and B?...

A tomato plant with large leaves and round fruits was crossed to a plant with small...

A tomato plant with large leaves and round fruits was crossed to a plant with small leaves and oblong fruits. The F1 consisted of plants with large leaves; about half of these plants made round fruits and the other half made oblong fruits. Two F1 plants (one with round fruits and one with oblong fruits) were then analyzed through further crossing. The results were: Cross F1 plant #1 with round fruits × parent with round fruits F1 plant #1 with...

JJ KK and jj kk individuals (parents) were crossed to each other, and the F1 were...

JJ KK and jj kk individuals (parents) were crossed to each other, and the F1 were testcrossed to the jj kk parent strain. The resulting offspring were: 999 Jj Kk : 999 jj kk : 1 Jj kk : 1 jj Kk. How would the testcross progeny ratios differ if the parents were JJ kk and jj KK instead? Multiple Choice >9 Jj Kk : >1 jj kk : <3 Jj kk : <3 jj Kk 1 Jj Kk :...

List the possible genotypes of the parents if a cross resulted in a F1-generation consisting of...

List the possible genotypes of the parents if a cross resulted in a F1-generation consisting of 50% white colonies and 50% red colonies: List the possible genotypes of the parents if the cross resulted in a F1-generation consisting of 100% tryptophan independent colonies: c. Give the genotypes and their percentages resulting from a cross between a homozygous independent tryptophan parent and a heterozygous tryptophan independent parent: Following a RrTt x RrTt cross, state the fraction of the offspring predicted to...

A true-breeding plant with red flowers was crossed with a true-breeding plant with white flowers. The...

A true-breeding plant with red flowers was crossed with a true-breeding plant with white flowers. The F1 progeny all had a new flower color, pink. The F1 plants were inter-crossed, and produced 44 red, 135 pink, and 61 white flower plants. (4 pts.) What is the most likely mode of inheritance being exhibited in these phenotypes. State your hypothesis and provide your reasoning, which can also include why other modes of inheritance are unlikely (process of elimination). Do not assign...

A pure breeding tall plant with smooth seeds was crossed with a pure breeding short plant...

A pure breeding tall plant with smooth seeds was crossed with a pure breeding short plant with wrinkled seeds. All the F1 plants were tall with smooth seeds. Two of these F1 plants were crossed and four different phenotypes were obtained in the 320 plants produced. How many tall plants with wrinkled seeds should you expect to find.

Subjects