Answer:
30
Explanation:
The seed of an angiosperm is formed as a result of fertilization (fusion of sperm in pollens and the ova from ovary). According to the question, the cells of the seed which will grow into the plant contains 20 chromosomes. Seeds of angiosperms contain a tissue called ENDOSPERM that forms as a result of the unique DOUBLE FERTILIZATION in angiosperms. It occurs when one haploid sperm cell fuses with two haploid polar nuclei to form a triploid endospermic structure that serves as food for the growing embryo in the seed.
Now based on the above explanation, the diploid plant cell with 20 chromosomes will have 10 chromosomes (half as much) in its gametes as a result of meiosis. This 10 chromosomes in each gamete (sperm and ovum) fuses to form a diploid zygote with 20 chromosomes, while one haploid sperm cell (10 chromosomes) also fuses with two haploid polar nuclei (10 chromosomes each) to form a triploid endosperm with 30 chromosomes i.e. 10+10+10.
Answer:
4
Explanation:
Mars Odyssey and Mars Express required spectrometric equipment that could analyze Mars's atmosphere
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Winter storm watch issued for Sun PM-Mon AM snow potential
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Winter Storm Watch - National Weather Service Watch Warning Advisory ...
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WINTER STORM WATCH IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY AFTERNOON... * WHAT...Heavy snow possible. Potential snow accumulations of 4 to 6 ...
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National Weather Service (.gov)
In the west, a series of storms will bring continued mountain snows and low elevation rains. River flooding will persist in the Mississippi and lower Ohio River Valleys into next week.
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A Winter Storm Watch is issued by the National Weather Service of the United States when there is a potential for heavy snow or significant ice accumulations.
Answer:
become more isolated.
Explanation:
Genetics can be defined as the scientific study of hereditary in living organisms such as humans, animals and plants.
Heredity refers to the transfer of traits (specific characteristics) from the parent of a living organism to her offspring through sexual reproduction or asexual production. Some examples of hereditary traits are dimples, tongue rolling, baldness, handedness, freckles, curly hair, color blindness, height, etc.
A population can be defined as the total number of living organisms living together in a particular place and sharing certain characteristics in common.
Generally, these populations may be divided into a fraction of the population (subpopulation) based on certain factors and reasons. When a population is fragmented into smaller subpopulations, it may become more isolated and experience very low genetic diversity i.e a drift in the genetic makeup of the total number of living organisms living together at a particular place (population).
Hence, fragmentation of a population into smaller subpopulations has an adverse effect because it would affect their health.
