Biology
- Autosomes & Sex Chromosomes
All About Autosomes and Sex Chromosomes: Let me start off by explaining that Autosomes and Sex Chromosomes are from the same chromosome, which contains 46 chromosomes total. In each chromosome there are TWO Sex Chromosomes out of the total 46...
- The Y Chromosome Has Several Male-specific Genes
KEY CONCEPTS:The Y chromosome has ~60 genes that are expressed specifically in testis. The male-specific genes are present in multiple copies in repeated chromosomal segments. Gene conversion between multiple copies allows the active genes to be maintained...
- What Is The Cause Of Turner's Syndrome?
A) Presence of additional copy of X-chromosome. B) Absence of one of the X-chromosomes C) Trisomy of chromosome number 21.D) None of these The correct answer is: B) Absence of one of the X-chromosomes...
- Diploid Chromosome Number
Humans have a diploid chromosome number of 46 chromosomes. In other words, there are a total of 46 chromosomes in human cells. The diploid number varies depending on each species. Having a diploid chromosome number means that an organism?s cells contain...
- # 29 Dna Structure
In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure....
Biology
What is the cause of Down's syndrome?
A) Presence of additional copy of X-chromosome i.e. 47 with XXY.
B) Presence of additional copy of chromosome number 21.
The correct answer is:
B) Presence of additional copy of chromosome number 21.
B) Presence of additional copy of chromosome number 21.
D) Lack of enzyme that converts the amino acid phenylalanine and into tyrosine.
The correct answer is:
B) Presence of additional copy of chromosome number 21.
- Autosomes & Sex Chromosomes
All About Autosomes and Sex Chromosomes: Let me start off by explaining that Autosomes and Sex Chromosomes are from the same chromosome, which contains 46 chromosomes total. In each chromosome there are TWO Sex Chromosomes out of the total 46...
- The Y Chromosome Has Several Male-specific Genes
KEY CONCEPTS:The Y chromosome has ~60 genes that are expressed specifically in testis. The male-specific genes are present in multiple copies in repeated chromosomal segments. Gene conversion between multiple copies allows the active genes to be maintained...
- What Is The Cause Of Turner's Syndrome?
A) Presence of additional copy of X-chromosome. B) Absence of one of the X-chromosomes C) Trisomy of chromosome number 21.D) None of these The correct answer is: B) Absence of one of the X-chromosomes...
- Diploid Chromosome Number
Humans have a diploid chromosome number of 46 chromosomes. In other words, there are a total of 46 chromosomes in human cells. The diploid number varies depending on each species. Having a diploid chromosome number means that an organism?s cells contain...
- # 29 Dna Structure
In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure....