Pink eye is a recessive trait found in deer mice. In a cross between two individuals, both of whom are heterozygous for the pink eye mutation, the following offspring are obtained:Normal 18
Pink eye 2
Use the chi-square test to determine if the observed numbers of offspring fit the expected numbers of offspring from this cross. The value of is: ____________
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Answer:
See the answer below
Explanation:
If pink eye is recessive, it means that the normal eye is the dominant trait. According to Mendelian law, the ratio of normal to pink eye in a cross involving two heterozygous mice should be 3:1.
Chi-square = where O = observed frequency and E = expected frequency.
Phenotype Observed Expected Chi-square
Normal 18 3/4 x 20 = 15 = 0.6
Pink 2 1/4 x 20 = 5 = 1.8
Total Chi-square = 0.6 + 1.8 = 2.4
Degree of freedom = 2 - 1 = 1
Critical Chi-square value at 95% = 3.841
The critical Chi-square value is more than the calculated value. Hence, the observed number of offspring fits the expected number of offspring.
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Answer: The frequency of the homozygous recessive genotype is the value of
-1 time
-2 times
- multiple times
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Answer:
- multiple times
Explanation:
Blastopore is a term used in embryology to refer to an extremity that acts as a means of communication in the embryonic phase, bringing the digestive cavity into contact with the external one. The blastopore forms in the embryonic gastrula period, at which stage cell differentiation begins. Later, another extremity may arise, also during embryonic formation.
Depending on the group to which the animal belongs, this orifice may primarily perform the mouth function - as is the case with protostomies - or initially act as anus of the organism - in the case of deuterostomies.
In either case, we can say that throughout evolution the final detecting of blastoporos has changed several times.
How many times has blastopore fate changed over the course of evolution1 time
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Answer:
No the cell wall is only found in plants
Explanation:
a. True
b. False
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Answer:
b. False
Explanation:
The spiral ganglion, formed from the primitive otocyst, is located on the cochlea's modulus (axis) and is made up of approximately 35,000 neurons in man. These bipolar neurons are of two types: type I and type II. Its peripheral extensions (dendrites) end in the spiral organ, in contact with the hair cells of which they receive information. Its central extension (axon) ends at the cochlear nuclei of the brainstem.
B.they are not cells
C.they do not contain chromosomes
D.all of the above
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