Do haploid organisms have one pair of homologous chromosomes?

Do haploid organisms have one pair of homologous chromosomes?

A haploid organism has one pair of homologous chromosomes. False. A haploid organism only has one set of chromosomes, so it has no homologous chromosomes. Meiosis is a reduction division that reduces the number of chromosomes passed on to daughter cells by one-half.

Which statement best explains why meiosis will be problematic in a triploid 3n organism see Section 13.1 page?

Which statement best explains why meiosis will be problematic in a triploid (3n) organism? Chromosomes will not align properly in meiosis I. Since there are three chromosome sets, some chromosomes will not form bivalents in meiosis I.

What statement about the difference between homologous chromosomes and sister chromatids is correct?

Which statement about the difference between homologous chromosomes and sister chromatids is correct? Homologous chromosomes contain the same genes, but may contain different alleles. Sister chromatids contain the same genes and the same alleles.

What are the limitations of karyotyping?

Some of the limitations of karyotype analysis include its requirement of a sample containing fresh viable cells and its low sensitivity for the detection of abnormalities, requiring a minimum of 5–10% of cells examined to contain the abnormality for optimal detection.

What type of information can be obtained from a karyotype?

Karyotypes can reveal changes in chromosome number associated with aneuploid conditions, such as trisomy 21 (Down syndrome). Careful analysis of karyotypes can also reveal more subtle structural changes, such as chromosomal deletions, duplications, translocations, or inversions.

For what purpose s might a karyotype be prepared?

For prenatal screening, to determine if a fetus has the correct number of chromosomes, to determine whether a fetus is male or female and to detect the possible presence of chromosomal abnormalities such as deletions, inversions, or translocations.

What is the failure of homologous chromosomes to separate during meiosis called?

1: Nondisjunction in Meiosis: Nondisjunction occurs when homologous chromosomes or sister chromatids fail to separate during meiosis, resulting in an abnormal chromosome number. Nondisjunction may occur during meiosis I or meiosis II.

What can happen if meiosis goes wrong?

But if meiosis doesn’t happen normally, a baby may have an extra chromosome (trisomy), or have a missing chromosome (monosomy). These problems can cause pregnancy loss. Or they can cause health problems in a child. A woman age 35 years or older is at higher risk of having a baby with a chromosomal abnormality.