6. Two true breeding varieties of plants are crossed in a two-factor cross. One parent has...

6. Two true breeding varieties of plants are crossed in a two-factor cross. One parent has red axial flowers and the other had white terminal flowers. All F1 individuals had red terminal flowers. The F1 offspring are then crossed to produce the F2 offspring.

a. Which traits are dominant? Which are recessive? What are the genotypes of the F1 individuals?

b. If 300 F2 offspring were counted, how many of them would you expect to have red, axial flowers. Show your work, including a Punnett square.

Expert Solution

6) a) Two true-breeding varieties of plants are crossed in a two-factor cross. One parent has red axial flowers and the other had white terminal flowers all the F1 progenies had red terminal flowers, so red flower colour and terminal flowers are dominant phenotypes.

b) let the alleles be R- red, r- white, T- terminal, t- axial.

RRTT * rrtt

RrTt

RrTt * RrTt

	RT	Rt	rT	rt
RT	RRTT ( red, terminal flowers)	RRTt ( red, terminal flowers)	RrTT ( red, terminal flowers)	RrTt ( red, terminal flowers)
Rt	RRTt ( red, terminal flowers)	RRtt ( red axial flowers)	RrTt ( red, terminal flowers)	Rrtt( red axial flowers)
rT	RrTT ( red, terminal flowers)	RrTt ( red, terminal flowers)	rrTT (white, terminal flowers)	rrTt (white, terminal flowers)
rt	RrTt ( red, terminal flowers)	Rrtt( red axial flowers)	rrTt (white, terminal flowers)	rrtt ( white axial flowers)

the proportion of red axial flowers= number of plants with red axial flowers/total number

= 3/16

expected number of plants with red axial flowers out of 300 plants= 300 proportion of red axial flowers

= 300 3/16

=56.25

expected number of plants with red axial flowers out of 300 plants = 56

gladiator answered 2 years ago

22. Mendel crossed true-breeding purple-flowered plants with true-breeding white-flowered plants, and none of the resulting offspring...

22. Mendel crossed true-breeding purple-flowered plants with true-breeding white-flowered plants, and none of the resulting offspring produced purple flowers. The allele for purple flowers is ____________. a. dominant b. monohybrid c. independent d. recessive e. segregated 23. An individual with (naturally) curly hair and an individual with (naturally) straight hair mate; all of their offspring have (naturally) wavy hair. If an individual with wavy hair mates with another individual with wavy hair, what is the probability that their child will...

ALL ARE MULTIPLE CHOICE In his breeding experiments, Mendel first crossed true-breeding _____ generation plants to...

ALL ARE MULTIPLE CHOICE In his breeding experiments, Mendel first crossed true-breeding _____ generation plants to produce the _____ generation, which were then allowed to self-pollinate to generate the _____ offspring. F ... P1 ... P2 P1 ... P2 ... P3 P ... F1 ... F2 P1 ... P2 ... F F1 ... F2 ... F3 Two organisms with genotype AaBbCcDdEE mate. These loci are all independent. What fraction of the offspring will have the same genotype as the parents?...

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 true breeding swan flower plant with smooth petals is crossed with a true breeding swan...

A true breeding swan flower plant with smooth petals is crossed with a true breeding swan flower plant with constricted petals. The offspring of this cross all have smooth petals. This indicates that 1) the offspring do not have a constricted allele in their genotype 2) smooth petals are dominant and constricted petals are recessive 3)constricted and smooth petals are not controlled by alleles 4) the F2 generation will have all smooth petals 5) constricted petals are dominant and smooth...

A true breeding red eyed fly with long bristles was crossed to a true breeding white...

A true breeding red eyed fly with long bristles was crossed to a true breeding white eyed fly with stubble bristles. All F1 progeny are red eyed with stubble bristles. An F1 female is crossed to a tester male and the following numbers of progeny are observed: 56 red eyed, stubble bristles; 72 red eyed, long bristles; 61 white eyed stubble bristles; and 68 white eyed, long bristles. You are asked to perform a chi-squared test for this result. 1....

1.One of the concerns about genetic modification of agricultural plants is the possibility of cross-breeding between...

1.One of the concerns about genetic modification of agricultural plants is the possibility of cross-breeding between herbicide-resistant GMOs and weeds, creating “superweeds” that would be resistant to commonly used herbicides. EXPLAIN how PCR could be used to determine whether such cross-breeding had occurred.

Imagine that you as a fruit fly researcher cross true breeding, wild-type flies to true breeding,...

Imagine that you as a fruit fly researcher cross true breeding, wild-type flies to true breeding, eyeless flies in the P generation. The resulting F1 generation is made up of 100% wild-type flies with normal eyes. Based on Mendelian genetics, what phenotype ratio would you expect to see for a F1 monohybrid cross? How would you go about determining the genotype ratio in the F2 generation? In cactus, the relationship between Gene S and Gene N is known to be...

1. You cross a true-breeding parental with yellow flowers and oval petals with a true-breeding parental...

1. You cross a true-breeding parental with yellow flowers and oval petals with a true-breeding parental with purple flowers and round petals. The F1 offspring have purple flowers and oval petals. a. Give the genotypes for the parentals and F1s (you can choose your own letters for the alleles): yellow flower oval petal parental: _____ purple flower round petal parental: _____ purple flower oval petal F1: _______ b. You perform a cross of the F1s, to produce the F2 generation....

Wheat kernels can be red, brown, or white. When true breeding reds are crossed with true...

Wheat kernels can be red, brown, or white. When true breeding reds are crossed with true breeding whites, all the offspring are brown. When these F1s are crossed you get the following results: 1883 Red kernels 1232 Brown kernels 197 White kernels There are varieties of brown, however, that are also true breeding. State a genetic hypothesis for inheritance of kernel color and test the above data for your hypothesis.

A mouse from a true-breeding population with normal gait was crossed to a mouse displaying an...

A mouse from a true-breeding population with normal gait was crossed to a mouse displaying an odd gait called “dancing.” The F1 animals all showed normal gait. If dancing is caused by homozygosity for the recessive allele of a single gene, what proportion of the F2 mice should be dancers if you cross two F1 mice? 25% 50% 75% 0% 33%

Question