Waec GCE 2025 First Series Biology Question And Answer Now Available

BIOLOGY OBJ
01-10: ACABDCBDBB
11-20: ABDBBBDBAB
21-30: AACDCBCBAC
31-40: ADDAADCCBC
41-50: DBDBDCBBDA

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2025 WAEC GCE FIRST SERIES BIOLOGY ANSWER

(1ai)
Homeostasis refers to the intrinsic regulatory mechanisms employed by biological organisms to maintain a stable internal environment despite external fluctuations.

(1aii)
(i)Kidneys
(ii)Liver
(iii)Hypothalamus

(1b)
Under type of neuron
(i)Sensory Neuron
(ii)Motor Neuron
(iii)Inter Neuron

Under function of neuron
(i)Transmits sensory information from receptors to the central nervous system
(ii) Conveys signals from the CNS to effectors, such as muscles and glands
(iii)Integrates information between sensory and motor neurons within the CNS

(1c)
[img]https://i.imgur.com/S05qnTs.jpeg[/img]

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(4a)
https://i.imgur.com/wnLOeF1.jpeg

(4b)
Type of Inheritance Illustrated The type of inheritance illustrated in this cross is -incomplete dominance. In this form of inheritance, neither allele is completely dominant over the other, resulting in a blending of traits in the phenotype of the offspring.

(4c)
Mechanism of Incomplete Dominance In incomplete dominance, the alleles for a trait blend together in the phenotype of the heterozygous offspring. In this case, the red allele (R) does not completely mask the expression of the white allele (r). Instead, when an R allele is combined with an r allele, the resulting phenotype is an intermediate color—in this case, pink flowers. This occurs because the expression of the alleles produces a phenotype that is a mixture of both parental traits, rather than one being dominant over the other.

(4d)
Test Cross with F1 Offspring A test cross involves breeding an individual of unknown genotype with a homozygous recessive individual to determine the genotype of the former. Let’s analyze the outcomes based on the F1 offspring (Rr), which are pink flowered.

(4di)
Genotype of the Parent The genotype of the parent used in the test cross is rr (homozygous recessive).

(4dii)
Phenotypes of the Result of the Cross The phenotypes of the result of the cross will be: – Pink flowers (Rr) – White flowers (rr)

(4diii)
Genotypes of the Result of the Cross The genotypes of the result of the cross will be: – Rr (pink) – rr (white)

(4div)
Genotypic Ratio of the Offspring Obtained The genotypic ratio of the offspring obtained from the test cross will be: – 1 Rr : 1 rr This means that there is a 50% chance for each genotype, resulting in a genotypic ratio of 1:1 for Rr (pink) and rr (white). This comprehensive analysis illustrates the principles of inheritance and the effects of dominant and recessive alleles on phenotypic expression.