1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vfiekz [6]
3 years ago
13

The expected ratio of phenotypes among the progeny of a test cross is 1:1:1:1. Out of 200 total resulting progeny, 48 occur in o

ne of the four phenotypic classes. Given this information, which of the following must also be true?
1) Since 48 is so close to the expected value, there is no need to calculate chi square before drawing a conclusion about the ratio.
2) At least one additional cell must also contain a count of 48.
3) The value of observed - expected for this cell = -2.
4) The progeny of this cross do not conform to a 1:1:1:1ratio.
Biology
1 answer:
Rzqust [24]3 years ago
3 0

Answer: The progeny of this cross do not conform to a 1:1:1:1 ratio

Explanation: This is because out of the 200 total resulting progeny, we must have 50 in each phenotype class to conform with the 1:1:1:1 which is not so as we have 48 in one of the phenotypic class already. Therefore, it did not conform to the ratio.

You might be interested in
Why do globular proteins need to be an exact shape in order to make the body run correctly
cricket20 [7]

   

   mc zc v.,vs<>ms.,dmv

6 0
3 years ago
What type of relationship does a cat and tapeworm have?
stellarik [79]

Answer:

Parasitism.

Explanation:

Parasitism is an association in which one organism, lives on another, the host, deriving benefit from it and causing harm to it.

The tapeworm here is a parasite and it lives inside the cat's(host) body where the tapeworm is specialized for its mode of life. It survive and reproduces very well without needing another specie because it is a hermaphrodite. It causes loss or poor development of unwanted organs such as the digestive, sense organs and muscles. Its long flattened body also provides a large surface area for absorption of nutrients too.

7 0
2 years ago
Which statements about the regulation of transcription initiation in these genes are true?
katovenus [111]
The answer is  7......
8 0
3 years ago
Mendel accounted for the observation that traits that had disappeared in the f1 generation reappeared in the f2 generation by pr
marysya [2.9K]

Answer:

Option C,  traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F1.

Explanation:

Complete question-

Mendel accounted for the observation that traits which had disappeared in the F1 generation reappeared in the F2 generation by proposing that

Select one:

a. new mutations were frequently generated in the F2 progeny, "reinventing" traits that had been lost in the F1.

b. the mechanism controlling the appearance of traits was different between the F1 and the F2 plants.

c. traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F1.

d. the traits were lost in the F1 due to dominance of the parental traits.

e. members of the F1 generation had only one allele for each trait, but members of the F2 had two alleles for each trait.

Solution -

In the Mendel’s experiment, some traits which were absent in the F1 generation appeared in the second generation cross. By this he concluded, that the traits exressed in the F1 generation were dominant and hence they capped the expression of traits associated witl recessive allele. He classified the traits in F2 generation as recessive, because these traits can occur only when they are in pair i.e they form individuals with homozygous recessive genotype.  

For instance – If “R” is allele for dominant red color trait and “r” is the allele for recessive white color trait, then the cross between true breeding red flowers and white flowers will produce following offspring  

RR * rr

Rr, Rr, Rr, Rr

Thus, in F1 generation all the offspring are heterozygous red

F2 generation-  

Rr * Rr

RR, Rr, Rr, rr

The recessive trait of white colored flower reappears in second generation.

Hence, option C is correct

8 0
3 years ago
DNA is replicated in the nucleus of eukaryotes, but in the cytoplasm of prokaryotes. Why is this?
umka2103 [35]

Answer:

In prokaryotes (organisms without a nuclear membrane), DNA undergoes replication and transcription and RNA undergoes translation in an undivided compartment. All three processes can occur simultaneously.

   In eukaryotes (organisms with a nuclear membrane), DNA undergoes replication and transcription in the nucleus, and proteins are made in the cytoplasm. RNA must therefore travel across the nuclear membrane before it undergoes translation. This means that  transcription and translation are physically separated. The primary transcript, heterogeneous nuclear RNA (hnRNA), undergoes extensive post-transcriptional processing to make a messenger RNA (mRNA)molecule that can pass through the nuclear membrane.

Explanation:

6 0
3 years ago
Read 2 more answers
Other questions:
  • What is the purpose of transcription?
    10·2 answers
  • A mutation in which one nucleotide is substituted for another is called a ____________.
    13·1 answer
  • What is the function of the tomato pulp cell? Also, do they have chromosomes?
    6·1 answer
  • How much genetic information is found in a gamete?
    7·1 answer
  • What is the relationship between observation and gathering data?
    6·1 answer
  • Why is a diet rich in protein very important to teens?
    13·1 answer
  • What happens to electrons when pigments in Photosystem II absorb light? They become excited and break down the pigments to relea
    12·2 answers
  • Mean by adaptation. ​
    9·2 answers
  • How do you add a stain to a slide without lifting the coverslip?
    11·1 answer
  • The trait for sickle cell anemia in humans shows a recessive pattern of inheritance. The alleles for sickle cell anemia in two i
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!