Answer:
The chance of a normal couple having a child with down syndrome is 1 to 600 births.
Explanation:
Down syndrome is a genetic flaw that occurs when the fetus is being formed.
A human cell considered normal has 46 chromosomes, divided into 23 pairs. For some unknown reason, an error may occur at the beginning of embryonic development and an extra chromosome is created, which binds to par 21. The result is cells with 47 chromosomes. This causes the said syndrome.
It is important to know that this failure happens at random. It is nobody's responsibility. It has not been proven to date that lifestyle, actions during pregnancy, smoking, drinking, medicines, environmental factors or kinship between the couple can influence this occurrence. She is not contagious either. The likelihood of a normal couple having a child with the syndrome is approximately 1 to 600 births.
Answer: B. False
Explanation:
“Hox” genes are a highly conserved group of genes, all of whose products are transcription factors bearing a specific domain (called a ”homeodomain”). The transcriptional activity of a large amount of genes relevant to embryonic development is controlled by regulatory sites which are able to bind to this domain. Changes in the transcriptional activity of even a single Hox gene may thus have dramatic downstream effects on the phenotype, as this will result in several further genes having their transcription either enhanced or suppressed.
Answer:
Difference Between Loose and Dense Connective Tissue
• Large proportion of ground substance and cells can be found in loose connective tissue,...
• Few loosely arraigned fibers can be found in loose connective tissue,...
• Loose connective tissue has more vessels than that of dense connective tissue.
• The loose connective tissue can be found beneath
Explanation:
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Answer:
2.) Laws of Genetics
Explanation:
George Mendel has discovered the fundamental laws of Genetics or inheritance by working on his pea plant, Mendel founds that Genes come in pairs and they are inherited as specific units each one is different from parents.
Inheritance Genetics is when something is passed down from one generation to the next generation.
Mendel law of genetics are three types:
- The Law of Segregation.
- The Law of Independent Assortment.
- The Law of Dominance.
