5. All fungi, plants, and animals spend most of their life cycle as diploids. Tr
ID: 148169 • Letter: 5
Question
5.
All fungi, plants, and animals spend most of their life cycle as diploids.
True
False
6.
After DNA replication each chromosome contains ____ chromatids.
4
3
2
1
7.
What is X-inactivation?
The abnormal inactivation of one X chromosome in female humans and other mammals.
The normal inactivation of one X chromosome in male humans and other mammals.
The normal inactivation of one X chromosome in female humans and other mammals.
The abnormal inactivation of one X chromosome male humans and other mammals.
8.
Crossing over occurs during which phase of meiosis?
Interphase
Telophase I
Metphase II
Prophase I
4
3
2
1
7.
What is X-inactivation?
The abnormal inactivation of one X chromosome in female humans and other mammals.
The normal inactivation of one X chromosome in male humans and other mammals.
The normal inactivation of one X chromosome in female humans and other mammals.
The abnormal inactivation of one X chromosome male humans and other mammals.
8.
Crossing over occurs during which phase of meiosis?
Interphase
Telophase I
Metphase II
Prophase I
Explanation / Answer
Ans.5. False,
Most fungi spend most of their life cycle as haploid organisms because diploid formation occurs in sexual reproduction in which two haploid cell, i.e. Ova and sperm fused to form zygote which is diploid.
Ans.6. 2,
After DNA replication the single chromatid divides to form two sister chromatids.
Ans. 7. The normal inactivation of one X chromosome in female humans and other mammals.
The abnormal inactivation is lead to form syndromes that is why it's normal inactivation in which one X chromosome is inactivated due to its presence in heterchromatin region of nuclues which is transcriptionally inactive.
Ans.8. Prophase I
Crossing over occurs in diplotene stage of prophase I in meiosis.
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