Polyploidy can result when: a translocation occurs between two chromosomes. a ha
ID: 267920 • Letter: P
Question
Polyploidy can result when:
a translocation occurs between two chromosomes.
a haploid sperm fertilizes a diploid egg.
one homologue does not split properly during anaphase II of meiosis
a developing gamete remains haploid.
Cells that have an extra copy of chromosome 21 would be referred to as:
trisomy
triploid
polyploid
disomy
Proteins isolated from bacteria and used to cut DNA at specific sequences are called:
plasmids.
methylating enzymes.
bacteriophages.
restriction enzymes.
A gene may have many alleles, but a person has only two alleles for a gene because:
having more than two alleles is always lethal
a gene can be altered in many ways, but a person has only two copies of any gene
a genotype is haploid due to meiosis
having more than two alleles unbalances a particular chromosome
Other than the nucleus, DNA can also be found in the:
Mitochondria
Ribosome
Lysosome
Vacuole
Organelles
DNA + Histones make:
Ribosomes
Lysosome
Nucleosomes
Nucleids
In transcription, uracil will bond with:
thymine
cytosine
adenine
guanine
Transcription
Centromeres:
determine chromosome arm length
join sister chromatids
split during anaphase
all of the above
Chromosomes
In messenger RNA, each codon specifies for a particular:
nucleotide
amino acid
purine
pyrimidine
Translation
The genotype of a child is influenced by that of the older sibling.
True
False
Punnett squares
Autosomes represent:
all chromosomes including the sex chromosomes
the half of the chromosomes inherited from one parent
all chromosomes other than the sex chromosomes
those chromosomes found only in gametes
Chromosomes
Twins generated from the same fertilized egg are scientifically known as:
Fibroblasts
Dizygotic twins
Monozygotic twins
Polyploid twins
twins
Twins generated from two separate fertilized eggs are scientifically referred to as:
fibroblasts
monozygotic twins
dizygotic twins
polygenic twins
twins
Explanation / Answer
1. Haploid sperm fertilized the diploid egg.
Polyploidy is the condition of presence of more than two sets of chromosomes in the cell. When a haploid sperm fertilizes the diploid egg It will form triploid zygote.
2. Trisomy.
Trisomy is an aneuploidic condition in which there are present 3 copies of chromosome . Trisomy 21 is a condition in which individual has 47 chromosomes with an extra chromosome no 21 in its body cells.
3. Restriction enzymes.
These are the enzymes which cut DNA at specific sites.
4.A gene can be altered in many ways, but a person has only two copies of any gene.
5.Mitochondria.
Mitochondria have their own DNA in the form double stranded circular DNA called mitochondrial DNA (mtDNA).