Explain why Down syndrome is more common in infants born to women older than 35 years of age?

Q: Differentiate congenital from genetic defects.

A: Genes are generally referred to as the basic unit of heredity. They are a part of DNA, and are…

Q: Explain how analysis of fetal DNA in the maternal circulation can provide information about a…

A: A trisomy is a chromosomal condition characterised by an additional chromosome.A person with a…

Q: explain why identical twins may have fewer genetic differences than fraternal twins?

A: Identical twins results from the fertilization (fusion of male and female gametes i.e., sperm and…

Q: Describe polygenic inheritance.

A: Polygenic inheritance is the inheritance of traits which is determined by multiple gene. These genes…

Q: Define monozygotic and dizygotic twins

A: Two haploid gametes combine into one diploid cell known as a zygote in a process called…

Q: To determine: The probability of a child being affected in IV generation if the male parent of…

A: A mutation is a defined in the way that it is stated to be the change in the sequence of DNA or RNA.…

Q: is an attached earlobe a dominant or recessive trait?

A: Answer: Introduction: Attached earlobes and free earlobes both are representative demonstrate the…

Q: Define trisomy 16.

A: Chromosome disorders are non-inheritable abnormalities in which individuals possess either extra or…

Q: Define  trisomy

A: The chromosome is the threadlike structure of the cell that carries hereditary information in the…

Q: Can two polydactylic people have a child without polydactyly? Explain.

A: It is otherwise called hyperdactyly, is an irregularity in people and creatures bringing about…

Q: Define partial dominance?

A: Sir Gregor Mendel was a priest and a teacher who did the famous hybridization experiment on garden…

Q: Describe two ways that an oocyte avoids polyspermy.

A: The fertilization of the egg takes place by the fusion of the sperm and the ovum. Sperm is produced…

Q: explain the results of crossing over?

A: Crossing over is the exchange of genetic material between non-sister chromatids of homologous…

Q: Define the following: monozygotic and dizygotic twins,

A: BASIC INFORMATION  FERTILIZATION  It is the process of the fusion of the male as well as the female…

Q: Explain what acquired genetic abnormalities (after birth)  are and why (almost always) they are not…

A: Genetic abnormality refers to the change in the genetic makeup of an individual due to various…

Q: Define recessive

A: A recessive trait can express itself only in the absence of a dominant trait. When present with its…

Q: Can diagnostic tests provide full information on the extentof effects of Down syndrome in an…

A: Chromosomes are made up of the strands of Deoxyribonucleic acid (DNA). This carries the genetic…

Q: Are all froms of Down Syndrome due to non-disjunction?  Explain

A: There are three forms of Down's Syndrome- 1. Trisomy 21 2. Non-disjunction 3. Mosaicism

Q: Identify disorders that are associated with sex-linked inheritance.

A: In human beings, sex is determined by a pair of sex chromosomes. In males XY and in females XX is…

Q: Explain how polygenic inheritance differs from inheritance that is controlled by only one gene?

A: Genetics is a part of science worried about the investigation of genes, genetic variation, and…

Q: Explain incomplete dominance?

A: Law of dominance states that when two alternative forms of a trait or character (genes) are present…

Q: Why the allele for Huntington disease is dominant?

A: Step 1 Huntington disease is an inherited disorder that causes the death of brain cells by the…

Q: Identify a disorder caused by a chromosomal abnormality and how the disorder affects the individuals…

A: Chromosomal abnormality are one of the main reasons for many inherited disorders and traits, and…

Q: Define multihybrid cross

A: A cross is a controlled breeding experiment in which two organisms of desired or considered trait…

Q: Explain the chances that a color-blind woman who is married to a man with normal vision will produce…

A: Let the genotype of color blind woman is XcXc and genotype of normal vision man is XY. We can…

Q: Explain about double fertilisation.

A: Nawaschin was the first to show that both male and female gametes are involved in fertilisation in…

Q: Explain why pregnant women often suffer from back strain late in their pregnancy.

A: Pregnancy, also known as gestation is the time during which one or more offspring develops inside…

Q: Calculate the probability of inheriting a particular genetic disorder by using a Punnett square.

A: Introduction Chance events are generally characterized by probability. Probability is defined as the…

Q: Explain the Reappearance of the recessive trait?

A: Genes are the basic structural and functional unit of heredity. They carry coded genetic information…

Q: If a male is colorblind, what information do you absolutely know about his daughters?

A: A gene is a sequence of nucleotides in genome that codes for a functioning molecule. There is…

Q: Explain inheritence of one gene?

A: Mendel performs the experiment on the pea plants by cultivating and observing them under different…

Q: Can two polydactylic people have a child without polydactyly? Please explain.

A: Polydactyly is a condition in which a baby is born with an additional finger or toe on each hand or…

Q: If individuals III-12 & III-16 seek an advice that if they marry, what is the probability of having…

A: Population genetics studies the inheritance of a trait from the parental generation to the…

Q: What are chromosomal Defects. List and Explain any 5 of them.

A: Almost every cell in our body contains 23 pairs of chromosomes, for a total of 46 chromosomes. Half…

Q: Explain the term double fertilisation.

A: A flower is the reproductive part of the modified thick shoot of an angiosperm plant. In order to…

Q: briefly describe how chromosomal disorders happen, explaining non disjunction

A: Chromosomal disorders are of two types -  1.Aneuploidy - It arises due to the addition or deletion…

Q: Contrast incomplete dominance and codominance

A: Dominance means the relationship between alleles of a single gene in genetics. To comprehend the…

Q: Define phenotype

A: Genetics is the branch of Biology dealing with the study of genes including their structure,…

Q: State the chromosomal theory of inheritance and explain the effect of linked genes on chromosomal…

A: Chromosome theory of inheritance In 1902 and 1903, Sutton and Boveri proposed this theory. This…

Q: Describe the cause and effect of Down syndrome.

A: Introduction:- genetic chromosome 21 disorder causing developmental and intellectual delays. Down's…

Q: Is a widow’s peak a dominant or recessive trait?

A: Dominant and recessive traits exist when a trait has two different forms at the gene level. The…

Q: Compare types of chromosomal abnormalities: numerical vs structural.

A: DNA is considered to be the genetic material within the nucleus that gets packed in thread-like…

Q: Differentiate a multifactorial disorder from a chromosomal disorder.

A: Multifactorial diseases are not confined and do not follow any specific pattern of single gene…

Q: Describe two mechanisms for causing uniparental disomy.

A: Describe two mechanism for causing uniparental disomy.