Biology, 01.10.2019 01:30 aeshaalhemri

Red fruits (t-) is dominant to tangerine fruits (tt), and smooth leaf (h-) is dominant to hair leaf (hh). suppose the recombination frequency between these genes is 16%. you take a pure-breeding plant with red fruits and smooth leaves and cross it with a pure-breeding plant with tangerine fruits and hairy leaves. you perform a test-cross with the f1 generation and produce 500 offspring. what is the approximate number of offspring for each possible phenotype?

Answers: 2

Show answers

Answers

Answer from: ashantajohnson6810

210 Red fruits, smooth leaf

210 Tangerine fruits, hair leaf

40 Red fruits, hair leaf

40 Tangerine fruits, smooth leaf

Explanation:

1) Cross between pure-breeding plant with red fruits and smooth leaves with a pure-breeding plant with tangerine fruits and hairy leaves.

Pure breeding means that the individual is homozygous for all genes.

The genotypes of these plants, considering that the T/t and H/h genes are linked, can be written as:

TH/TH (same as TTHH) and th/th (same as tthh)

This cross will have a homogeneous F1 offspring: TH/th.

2) Test-cross of the F1

A test cross is a cross between any individual and a homozygous recessive individual.

The gametes produced by the parents are:

Homozygous recessive th/th: only th gametes (parental).F1 individual TH/th: TH (parental), th (parental), Th (recombinant), tH (recombinant).

The frequency of recombination between these genes is 16%, so the total percentage of recombinant gametes produced by the F1 individual is 16%. Because there are 2 possible recombinant gametes, each of them will appear in 8% of the total produced gametes (to add up to the total of 16%).

The other possible gametes are parental, which will appear in 84% of the cases (total 100% minus the recombinant 16%). Because there are 2 possible parental gametes, each of them will appear in 42% of the cases.

The th gamete will be inherited by all of the individuals of the offspring, so the phenotypes of the offspring will be determined by which gamete they inherited from the F1 parent.

The phenotypes of the offspring will be:

Red fruits, smooth leaf (TH/th): 42% x 500 = 210Tangerine fruits, hair leaf (th/th): 42% x 500 = 210Red fruits, hair leaf (Th/th): 8% x 500 = 40Tangerine fruits, smooth leaf (tH/th): 8% x 500 = 40

Answer from: Quest

[ answer ]

foliated

[ explanation ]

foliation forms in a rock when pressure squeezes the rock together. the rock then has a design of many different color little lines. there are three types of foliated rock. the types are slate, schist, and gneiss. each type of foliated rock is different based on grain size and foliation characteristics. the lines appear when the rock has been under pressure.

< > arsenal < >

Answer from: Quest

what bodys are there orbiting?

Another question on Biology

Biology, 22.06.2019 05:30

Diego conducted an experiment to find out what kind of ball bounces the highest when dropped from a five-foot platform. he used a golf ball, a tennis ball, and a soccer ball. he dropped each ball from the balcony once. diego recorded his observations after each drop. what can diego do to best improve the reliability of his results? a) drop each ball from the platform three more times b) record his observations in more than one unit c) write at least two scientific questions after the experiment is complete d) share his results with other people who have done similar experiments you for the !

Answers: 1

Answer

Biology, 22.06.2019 14:00

To confirm when to exclude children from school it’s recommended that you refer to guidelines from which of the following organizations

Answers: 1

Answer

Biology, 22.06.2019 17:00

Which of the following is a feature of all cells? o a. all cells have a nucleus. o b. all cells have dna for at least part of their life cycle. het . o c. all cells are spheres. o d. all cells have a rigid cell wall.

Answers: 1

Answer

Biology, 22.06.2019 17:50

How does a catalyst influence a chemical reaction?

Answers: 1

Answer

You know the right answer?

Red fruits (t-) is dominant to tangerine fruits (tt), and smooth leaf (h-) is dominant to hair leaf...

Questions