In a plant in which fuzzy leaves (F) are dominant over smooth leaves (f), which of the following crosses will produce only offspring with smooth leaves?   

A. FF x FF

B. Ff x Ff

C. ff x ff

D. Ff x ff

Answer Explanation:

ff.

In this cross, both parents are homozygous recessive for the smooth leaf trait

(ff).

This means that all of their offspring will inherit two copies of the recessive allele (f) and will therefore have smooth leaves.

Choice A.

FF x FF is not correct because both parents are homozygous dominant for the fuzzy leaf trait (FF) and all of their offspring will inherit two copies of the dominant allele (F) and will therefore have fuzzy leaves.

Choice B.

Ff x Ff is not correct because both parents are heterozygous for the leaf trait (Ff) and their offspring can inherit either one dominant allele (F) or one recessive allele (f) from each parent, resulting in a 3:1 ratio of fuzzy to smooth leaves. Choice D.

Ff x ff is not correct because one parent is heterozygous for the leaf trait (Ff) while the other is homozygous recessive (ff), resulting in a 1:1 ratio of fuzzy to smooth leaves in their offspring.

Therefore, the Correct Answer is C.

Q #1: Which of the following represents the complementary strand of a DNA sequence 3' TCGATCGCA 5'?

A. 3' AGCTAGCGT 5'

B. 5’ AGCTAGCGT 3’

C. 5' UCGAUCGCA 3'

D. 3' TCGUTCGCU 3'

Answer Explanation

In DNA, the nitrogenous bases adenine (A) and thymine (T) pair together, while cytosine (C) and guanine (G) pair together.

Therefore, the complementary strand of the given DNA sequence 3' TCGATCGCA 5' would have the complementary nitrogenous bases as:

5’ AGCTAGCGT 3’

NOTE: The 5’ to 3’ direction of the complementary strand is opposite to that of the given strand.

Choice A.

3’ AGCTAGCGT 5’ is not correct because it is not complementary to the given strand.

Choice C.

5’ UCGAUCGCA 3’ is not correct because it contains uracil (U), which is a nitrogenous base found in RNA, not DNA.

Choice D.

3’ TCGUTCGCU 3’ is not correct because it also contains uracil (U), which is a nitrogenous base found in RNA, not DNA.
Q #2: Which of the following is a group that can be measured against the experimental group?

A. Responding

B. Manipulated

C. Control

D. Variable

Answer Explanation

Control.

A control group is a group in an experiment that does not receive the treatment or manipulation being tested and is used as a benchmark to measure how the other tested subjects do.

The control group is used to minimize the effects of all variables except the independent variable.

This allows researchers to determine if changes in the dependent variable are due to the manipulation of the independent variable or if they are due to some other factor.

Choice A.

Responding is not the correct answer because it refers to the dependent variable, which is the variable that is being measured in an experiment.

Choice B.

Manipulated is not the correct answer because it refers to the independent variable, which is the variable that is being manipulated in an experiment.

Choice D.

Variable is not the correct answer because it refers to any factor that can change in an experiment and can include both independent and dependent variables.
Q #3: Parasitic worm infestation is hypothesized to be damaging to the host. However, scientists have recently discovered that worm infestation can relieve the effects of certain autoimmune disorders. In which of the following ways should the hypothesis be modified, given the new findings?  

A. Worm infestation prevents the body from immune malfunction

B. Worm infestation reduces the severity of certain autoimmune disorders

C. Worm infestations exacerbate the body's immune reactions

D. Lack of worm infestations is the cause of some autoimmune disorders

Answer Explanation

The hypothesis should be modified to include the new findings that worm infestation can relieve the effects of certain autoimmune disorders.

A possible modification could be: “Parasitic worm infestation can have both damaging and beneficial effects on the host.

While it can cause harm, it has also been found to reduce the severity of certain autoimmune disorders.”

Choice A.

Worm infestation prevents the body from immune malfunction is not correct because it overstates the findings and implies that worm infestation completely prevents immune malfunction, which is not supported by the evidence.

Choice C.

Worm infestations exacerbate the body’s immune reactions is not correct because it contradicts the new findings that worm infestation can relieve the effects of certain autoimmune disorders.

Choice D.

Lack of worm infestations is the cause of some autoimmune disorders is not correct because it overstates the findings and implies a causal relationship between lack of worm infestations and autoimmune disorders, which is not supported by the evidence.

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In a plant in which fuzzy leaves (F) are dominant over smooth leaves (f), which of the following crosses will produce only offspring with smooth leaves?

More Questions on TEAS 7 Science

Q #1: Which of the following represents the complementary strand of a DNA sequence 3' TCGATCGCA 5'?

Answer Explanation

Q #2: Which of the following is a group that can be measured against the experimental group?

Answer Explanation

Q #3: Parasitic worm infestation is hypothesized to be damaging to the host. However, scientists have recently discovered that worm infestation can relieve the effects of certain autoimmune disorders. In which of the following ways should the hypothesis be modified, given the new findings?

Answer Explanation

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In a plant in which fuzzy leaves (F) are dominant over smooth leaves (f), which of the following crosses will produce only offspring with smooth leaves?&nbsp; &nbsp;

More Questions on TEAS 7 Science

Q #1: Which of the following represents the complementary strand of a DNA sequence 3&#39; TCGATCGCA 5&#39;?

Answer Explanation

Q #2: Which of the following is a group that can be measured against the experimental group?

Answer Explanation

Q #3: Parasitic worm infestation is hypothesized to be damaging to the host. However, scientists have recently discovered that worm infestation can relieve the effects of certain autoimmune disorders. In which of the following ways should the hypothesis be modified, given the new findings? &nbsp;

Answer Explanation

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In a plant in which fuzzy leaves (F) are dominant over smooth leaves (f), which of the following crosses will produce only offspring with smooth leaves?

Q #1: Which of the following represents the complementary strand of a DNA sequence 3' TCGATCGCA 5'?

Q #3: Parasitic worm infestation is hypothesized to be damaging to the host. However, scientists have recently discovered that worm infestation can relieve the effects of certain autoimmune disorders. In which of the following ways should the hypothesis be modified, given the new findings?