Why are people with balanced chromosomal translocations phenotypically normal? Do they suffer from reduced fertility?  Why?

Q: How can epistasis explain incomplete penetrance?

A: Penetrance in genetic terms refers to the ratio of individuals that carry a specific allele of a…

Q: What is Extrachromosomal inheritance?

A: Inheritance is the process by which this genetic information present in the genes is passed on from…

Q: Explain the causes of familial Down syndrome.  How does it differ from Down syndrome due to…

A: Down syndrome is a disorder in which individuals have an extra copy of chromosome 21 instead of two…

Q: What are twins?Genetically what are the twotypes of twins that can begenerated?

A: Pregnancy is also termed as gestation during which one or more offspring develop in the uterus of a…

Q: What are polytypic genes?

A: Genes are defined as the building blocks and the coded information that defines the complete physico…

Q: What is the relationship between non-disjunction, changes in chromosome number and miscarriage?  Why…

A: Chromosome abnormalities are of 2 types viz. numerical, where an individual has abnormal number of…

Q: In a woman who is a carrier of a mutant OTC deficiency allele, her sons who receive the mutant…

A: An alteration in the ornithine transcarbamylase (OTC) gene results in the genetic disorder known as…

Q: Table 8.1 shows that Turner syndrome occurs when an individual inherits one X chromosome but lacks a…

A: Chromosomal deletion syndrome occurs when whole or part of chromosomes are missing. Turner Syndrome…

Q: What are choromosome theory of inheritence?

A: The Chromosomal Theory of inheritance was suggested by two scientists named Sutton and Boveri, which…

Q: Draw a Punnett square for the dihybrid cross. There are two known alleles of gene occupying a…

A: Dihybrid cross involves two genes in a cross. That's why the two traits are involved in this cross.

Q: Why do most cases of Down syndrome originate from the mother? And how is this linked to maternal age…

A: Down syndrome also called "trisomy 21" is a condition in which a child is born having an additional…

Q: How is Down syndrome caused?

A: Human genetic disorders are caused due to the absence or excess or abnormal arrangement of one or…

Q: Why must the carrier of a genetic disease be heterozygous?

A: Homozygous means a person carries two identical pair of the gene whereas heterozygous means the…

Q: What is meant by the term diploid? Which cells of the humanbody are diploid, and which cells are…

A: The ploidy term refers to the number of sets of the chromosomes. The euploidy refers to the…

Q: How to reduce chromosomal abnormalities?

A: Chromosomal abnormalities can be structural or numerical. A structural chromosomal abnormality means…

Q: What is the most common chromosomal disorder?

A:

Q: What causes Extrachromosomal inheritance?

A: Inheritance or heredity is passing-on one trait form the parents to the progeny by either asexual or…

Q: Explain Loss of p53 function leads to genomic instability?

A: The TP53 gene provides instructions for making a protein called tumor protein p53 (p53). This…

Q: How is it that genetic abnormalities that include an extra Y chromosome do not have a severe…

A: Genetically all human males normally have a XY chromosome whereas the females have a XX pair. They…

Q: What is the meaning of term haploinsufficiency?

A: The gene is the basic physical and functional unit of heredity. Genes are made up of…

Q: Why are there so few Y-linked traits in humans?

A: The study of genetic variations, heredity, and genes is called genetics.