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Question
Mendel crossed true-breeding pea plants and found the dominant trait always appeared in the F1generation, but it appeared in a ________ ratio of dominant to recessive in the F2generation.
A) 1:3
B) 1:2
C) 3:1
D) 1:1
Answer
This answer is hidden. It contains 1 characters.
Related questions
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Which of the following best describes the period during which the developing offspring is considered a fetus?
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The sequence of development of sperm is:
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On average, about how often does ovulation occur?
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Through what structure does an oocyte travel on its way to the uterus?
A) uterine tube
B) cervix
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If you could stop diffusion of substances in fruit fly zygotes, could you stop normal development? Why or why not?
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Programmed cell death is also known as ________.
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You are a substitute teacher in a high school biology lab class on the day the students are dissecting frogs. A particularly bright student happens to notice that the left adrenal gland is malformed in her frog. She asks if a problem in embryonic development could have caused that. Although there may be more than one reason, what might you propose as an explanation based on embryonic development?
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Match the following. Answers may be used more than once.A) cleavageB) organogenesisC) gastrulationNeural tube forms
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Cells become more and more specialized as development progresses.
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Eye cells can become beak cells once they are committed.
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The blastula is the stage of embryonic development in which cells migrate.
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The end of a zygote that contains less yolk is the animal pole.
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ZPA cells of the chick embryo produce which morphogen?
A) sonic hedgehog
B) sonic chicken
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D) chicken wing factor
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Which of the following is a process by which an initial set of genes turns on a second set of regulatory genes, which eventually turns on a third set of genes?
A) developmental chain reaction
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D) the genetic cascade
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What is the effect of higher concentration of bicoid protein in part of a fruit fly embryo?
A) It will develop into the posterior end of the organism.
B) It will develop into the heart of the organism.
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Of the choices listed, the first event that occurs during embryonic development is:
A) germ layer formation.
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The phase during which embryonic cells arrange themselves into three layers is called:
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B) gastrulation.
C) organogenesis.
D) fertilization.
E) induction.