Among the following patterns, which is likely to represent the phenomenon of senescence? Please note that the x-axis represents the age and the y-axis the number of offspring (the solid lines) or the probability of survival (the dashed lines). (A) (B) (C) (D)

Q: In fruit flies, normal wings (A) are dominant to dumpy wings (a) and the presence of eyes (B) is…

A: A dihybrid cross is a hybridization experiment in which two pairs of contrasting characters are…

Q: Discuss and elaborate thoroughly the statement “oocyte activation involves inactivation” using…

A: In mammals, fertilization involves a series of consecutive steps that starts with the recognition…

Q: Among the following patterns, which is likely to represent the phenomenon of senescence? Please note…

A: We can say that Senescence is the process by which a cell aged and stop dividing any further. This…

Q: Assume that in Michigan squirrels, dark brown fur (B) is dominant to black fur (b). If you mate a…

A: Given  Brown fur(B) dominant  Black fur (b) recessive  Parents  Homozygous brown (BB)  Homozygous…

Q: (i)Draw a diagram of Metaphase I and II of meiosis in the father, which illustrates the only…

A: In this situation, we need to figure out the genes and processes that cause a particular child to…

Q: In a cell that has just begun the process of meiosis, as shown, what is the probability that a…

A: Meiosis It is defined as the cell division in which four haploid cells are generated from a single…

Q: a punnet square, what is represented by the inside boxes? a) The gametes of the parents b) Possible…

A: In a punnett square One parent's alleles are listed across the top of the table, and the other…

Q: What gamete must be donated by the father monster, and what is its probability? a) g l — 12.5% b) g…

A: Gametes are produced by the process of meiosis.

Q: Question 15: Consider the consequence if one of the mutations you tested for complementation was a…

A: Introduction:  A mutation is a change in the DNA sequence of an organism. Mutations can happen as a…

Q: Inspect this figure showing relations of parents and offspring in species with haplodiploid sex…

A: Relatedness value is the probability that two individuals share an allele due to recent common…

Q: A report in the New England Journal of Medicine (Seminar et al. 2003) relayed a discovery about a…

A: Suppose, we have two gene a and A  a is carried the disease  Aa- carrier  AA- normal aa- affected…

Q: A XY individuals transcribe the Sxl gene early but not late. B XX individuals carry the Sxl gene, XY…

A: Sex lethal genes Sxl is a gene that is involved in the exression of the X:A signal . It is a…

Q: In mammals, males often have greater variance in reproductive success than females, as a result of…

A: Males have heteromorphic sex chromosomes that is two different types of sex chromosomes X and Y,…

Q: If the blue F1 females in Figure  are backcrossed to the blue males in the P generation, what…

A: Genotype is the genetic constitution of an individual organism. Phenotype is the observable…

Q: Identify the stage of meiosis diploid cells of this species have 3 homologous pairs of chromosomes a…

A: Introduction  Cell division is the process by which a single cell divides into two or more daughter…

Q: In a certain species of birds which produce many offspring per mating, the following modes of…

A: According to guidelines we have to answer the first 2-3 question only. so please kindly post the…

Q: Two normal-looking fruit flies were crossed and, in their progeny, there were 202 females and 98…

A: •The proportion 202 and 98 of females to male fruit fly progeny is compatible with the ratio 2 : 1.…

Q: Put the following in order in mitosis and the preceding interphase Hint: Determine whether the event…

A: In eukaryotes, Cells divide either via mitosis or meiosis. Somatic cells divide via mitosis.…

Q: The four daughter cells pictured below resulted from: A) normal mitosis B) fertilization with a…

A: Meiosis is a type of cell division that results in the formation of four new daughter cells with…

Q: Which of the following is least likely to produce genetic variation in the offspring of an…

A: Genetic variation is the changes in the genes of offspring from the parents. Meiotic cell division…

Q: In mice, the Sry gene is located on the Y chromosome very close to one of the pseudoautosomal…

A: The chromosomes are the genetic material present in the nucleus of the cell which is a condensed…

Q: 9.1 Label structures A, B and C. (3) 9.2 State THREE functions of D. (3) 9.3 Fertilisation usually…

A: The female reproductive system consists of sex organs(both internal and external) that helps in the…

Q: Homologous chromosomes a) are formed when the chromosomes separated during anaphase b) are matching…

A: The nucleus of cell contains chromosomes. Chromosome are the structures that resemble threads. They…

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A: Meiosis is a sort of cell division in sexually reproducing animals that results in the production of…

Q: In some genetically engineered corn plants, a Bt gene was inserted into a chromosome. The Bt gene…

A: INTRODUCTION       The genetically modified organisms in Bt corn are mainly called GMOs. In…

Q: Domesticated sheep cells have a total of 54 chromosomes (versus 46 chromosomes in human cells). (a)…

A: Chromosomes are the structures that carry DNA.

Q: In fruit flies a dominant mutation on the X chromosome causes the eye to be oval instead of round.…

A: Introduction :  Gene is a unit of heredity. It contains the genetic information. It is made up of…

Q: For each of the following, identify what characteristics of a species male and female karyotype…

A: Answer :- Option (B) is correct. - XY sex chromosomes.

Q: Select the best answer or answers from the choices given: Relative to differences between mitosis…

A: The mechanism via which a cell called the parent cell divides to form two or more daughter cells is…

Q: Scale color in a lizard species is inherited via a single gene with 6 different alleles. (a) How…

A: Apart from the openings of eyes, mouth, nostrils, and cloaca, most of the lizards are totally…

Q: Meiosis and sexual reproduction are, in large part, responsible for genetic variation within a…

A: Cell division is the type of cell division that is involved in the production of germ cells organic…

Q: Corn has a diploid number of 20. How many chromatids are present in prophase? (a) (b) (c) (d) 5 10…

A: Correct Answer: d) 40

Q: sex determenination.

A: In humans males are heterogametic and females are homogametic. heterogametic means production of…

Q: You are an allele on a single uncondensed chromosome in a Yellow fever-carrying mosquito (Aedes…

A: The somatic cells follow the mitotic process for division and the reproductive cells or gametes are…

Q: 7. Maternal effect: In Limnaea snail cats, R makes right coiled shells; r makes left coiled shells,…

A: The maternal effect refers to an inheritance pattern in genetic, where the phenotype of the…

Q: Discuss the following concepts: (a) homologous chromosomes x ½ = 2) (b) diploidy (c) haploidy

A: Chromosomes are defined as the bundles or groups of tightly and highly coiled DNA located within…

Q: Which of the following does not occur in meiosis? (a) (b) (c) Homologous pairs form tetrads. Haploid…

A: In meiosis, one cell diploid undergoes division to form four haploid cells.

Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.