Solution: The cross between the F2 progeny of the same plant is - Hence, the correct answer is (c) (ii) and (iii).

Solution:  The seeds of F1 plants are round and yellow. In the F2 generation, crossing between generations can result in new combinations of round-yellow, round green, wrinkled yellow, and...

Solution:  The following are the basic characteristics of the inheritance mechanism: Characters are controlled by genesGenes exist in two or more formsOne gene form may be dominant over...

Solution: RrYy- Round and yellow rryy- Wrinkled and green RRYY- Round and yellow ryryryryRYRrYy Round and yellow seedsRrYy Round and yellow seedsRrYy Round and yellow seedsRrYy Round and yellow...

CrossProgenyRR YY x RR YY ……………………… Round, yellow x Round, yellow Rr Yy x Rr Yy ……………………… Round, yellow x Round, yellow rr yy x rr yy ……………………… wrinkled green x wrinkled, green RR YY...

Solution: Morphological structures are structures that are visible to our eyes. Molecular structures are biomolecules that are essential parts of living organisms. We are surrounded by a lot of...

Solution: Our bodies' responses to external stimuli such as diet, disease, and climate change result in acquired traits. This leads to the emergence of a specific attribute characterised by...

Solution: The differences between inherited and acquired characters are- Inherited CharactersAcquired CharactersCharacter traits are passed down from parents to their children.Characters that exist...

Solution: Although all human races appear to be distinct, they all share a common ancestor. The evidence in support of this viewpoint is as follows. • Brain size is similar. • Bipedal movement • The...

Solution: This is a controversial subject as it all depends on how we assess evolution. If the body's complexity is a criterion, humans are considerably superior to germs. Bacteria organise...

Solution: Genetic drift occurs when individuals of a species are isolated geographically. This restricts the segregated population's sexual reproduction. Separated individuals reproduce among...

Solution: The fact that a woman has only one daughter suggests that the egg has always acquired the X chromosome from the sperm. If sperm contributes X chromosomes, the child will be female;...

Solution: Pea plants were chosen for Mendel's experiments because they are easy to grow, have a short life period, and produce larger flowers. Pea plants are also self-pollinated.

Solution: The following are the pair of contrasting traits of the following characters in pea plant – Yellow is the dominant one whereas Green is the recessive allele. Round is the dominant one...

Solution: Animals do not share a common ancestor, even though they have a wide range of structures. This is because shared ancestry can severely limit diversity. Since many of the creatures share...

Solution: Homologous structures have the same basic structure as each other but serve different functions. Reptiles, amphibians, and mammals, for example, have forelimbs. If they don’t have common...

Solution: Due to the following factors, a very small population of a species faces a greater chance of extinction than a larger population- Inbreeding: Inbreeding is encouraged by a small...

Solution: The gamete donated by the male determines the sex of the baby. The 23rd pair of chromosomes in males are X and Y. The proportion of X to Y is 1:1 As a result, the chances of having a...

Solution: In their 23 pairs of chromosomes, females have XX. Since each gamete receives one X chromosome during meiosis, all-female gametes have one X chromosome.

Solution: The three important features of fossils that help in the study of evolution- Fossils are ancient organisms that have been preserved.Fossils aid in the identification of evolutionary...

Solution: The chromosome supplied by the father will determine the sex of a newborn. Mothers' 23rd chromosomal pair contains XX, and they always donate one X. Fathers, on the other hand, have the X...

Solution: The individual's sex is decided by the genes he or she got from their parents. If a baby inherits X chromosomes from the father, the child will be female; if the newborn receives Y...

Solution: Dinosaurs had feathers, but they couldn't fly. The feathers were later developed for flight by birds. Dinosaurs were reptiles, which indicates that birds descended from them. So, the...

Solution: The rules of heredity were suggested by Mendel, also Morgan was the first to discover a mutation in drosophila. The use-and-disuse idea was proposed by Lamarck. So, the correct answer is...

Solution: The sex of the offspring is determined by the 23rd pair of chromosomes, which is why it is termed a sex chromosome. So, one pair of chromosomes determines the sex of the individual. So,...

Solution: Progenies with the genotypes below would result from a cross between pure tall plant (TT) and short plant (tt). TT (Pure tall), tt (Pure short), and Tt (Pure short) ( Mixed tall). This...

Solution: Since genes code for specific proteins, statement ii) is incorrect. Because chromosomes can have any number of genes, Statement 4 is incorrect. Hence, the correct answer is (b) (i) and (iii)

Solution: This is the explanation for one progeny's expression in one version and another progeny's expression in another. So, the answer is (b) two different chromosomes.

Solution: The body's nature is determined by a person's eating habits. Regular exercise aids in the development of a muscular physique. Because bodily nature is not passed along to kids, the body...

Solution: Several generations of DNA variation result in the formation of new species. Since there are no gametes involved in asexual reproduction, there will be no variety. Individual movement...

Solution: Since species is the lowest taxon, members of the same species have the greatest number of shared features. So, the correct answer is (a) two individuals of a species.

Solution: Both parents contribute DNA to their offspring, and hence both parents contribute traits to their progeny. So, the correct answer is (c) both maternal and paternal DNA.

Solution: Since only useful variation has a chance of surviving, statement a) is incorrect. To survive, nature selects the most adaptable variant. This is Darwin’s theory of Natural selection. So,...

Solution: Deep in the soil, older fossils can be unearthed. As a result, option b) is the correct response. So, the answer is (b) the extinction of organisms has occurred thousands of years ago.

Solution: Due to similar design and origin, a pea plant's tendon and an Opuntia phylloclade are homologous. So, the correct answer is (a) Tendril of a pea plant and phylloclade of Opuntia are...

Solution: They both have a similar structure and grow beneath the earth's surface ( Roots). So, the correct answer is (c) Radish and carrot.

Solution: Evolution will not occur until the genetic material changes and alters. As a result, the evolution of new species necessitates changes in genetic material and chromosome variety. So, the...

Solution: Option b) is incorrect because weight loss and growth are influenced by external causes rather than hereditary factors. So, the correct answer is (b) Reduction in weight of the organism...

Solution: The egg zygote will develop into a male offspring if sperm containing the Y chromosome fertilizes it. The egg zygote will develop into a female child if sperm with the X chromosome...

Solution: The egg zygote will develop into a male offspring if sperm with the Y chromosome fertilizes it. The egg zygote will develop into a female child if sperm with the X chromosome fertilizes...

Solution: Due to the half size of the Y chromosome, they are sex-determining chromosomes that are not properly paired. So, the correct answer is (c) (iii) and (iv).

Solution: Since round and yellow are the prominent traits, all seeds in the first generation will be round and yellow. So, the correct answer is (a) round and yellow.

Solution: Option d is incorrect since every protein, enzyme, and hormone is regulated by a specific gene, whereas fats are not controlled by a gene. So, the correct answer is (d) for every molecule...

Solution:  Only dominant traits are expressed in the first progeny of a monohybrid cross. So, the correct answer is (a) tallness is the dominant trait.

Solution: If the cross is between red and white flowers, only then will offspring be pink in colour. So, this is only possible if there is cross-fertilization. Hence, the correct answer is (c)...

Solution: Other methods, other than sexual reproduction, include a sort of asexual reproduction in which only one parent is involved. As a result, genetic material is exchanged during sexual...