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The correct answer is B. Be colour blind. Since the boy has the genotype YXn: - The Y chromosome indicates that he is male. - The Xn allele is the recessive allele for colour blindness. As a male, he only has one X chromosome, and since it carries the Xn allele, he will express the trait of colour blindness. Males are more likely to express X-linked recessive traits, such as colour blindness, because they have only one X chromosome. Females, on the other hand, would need to inherit two copies of the Xn allele (one from each X chromosome) to express colour blindness. The other options are not correct: A. The boy will not have normal vision because he has the Xn allele. C. The boy will not be totally blind; colour blindness is a specific visual impairment, not total blindness. D. The boy cannot be a carrier of colour blindness because he is male and only has one X chromosome. Carriers are typically females who have one Xn allele and one normal allele (XN).

the number of boys or girls the couple has given birth to does not affect their future offspring so it's 1/2 because it is either a boy or a girl

Most people — about 85% — are Rh positive. But if a woman who is Rh negative and a man who is Rh positive conceive a baby, there is the potential for a baby to have a health problem. The baby growing inside the Rh-negative mother may have Rh-positive blood, inherited from the father. Approximately half of the children born to an Rh-negative mother and Rh-positive father will be Rh positive

No expanded working has been attached for this question yet. The verified answer is Option A.

The first to evolve is the bony fish which evolved from a jawless fish. The amphibians evolved next after fish. The first amphibians evolved from a lobe-finned fish ancestor about 365 million years ago. They were the first vertebrates to live on land, but they had to return to water to reproduce. For this reason, they had to live near water bodies. They had few characteristics of fish in their early life. The reptiles evolved from the amphibians. They lived completely on land. They laid amniotic eggs and had fertilization. They were the first vertebrates that didn't have to return to water for reproduction. Reptiles developed certain added features such as feathers, hollow bones, and warm bodies. These animals were called birds or Aves. Then mammals. Note: Mammals and birds both evolved from reptiles-like ancestors.

The primary hormone facilitating facial hair development in both men and women is testosterone, along with its derivative dihydrotestosterone (DHT). These androgens stimulate hair follicle growth, converting fine, vellus hairs into thicker, darker terminal hairs, particularly in areas like the face, chest, and back. Testosterone is the main androgen hormone responsible for the development of male secondary sexual characteristics, including facial hair. It also plays a role in hair growth in women, although in lower concentrations. Testosterone is primarily found in the testicles (testes) in men and ovaries in women. Additionally, adrenal glands in both sexes also produce testosterone, though in smaller amounts.

Ovoviparity is a reproductive strategy where embryos develop inside eggs that are retained within the female's body until they hatch, resulting in live birth, but without placental attachment. Some reptiles (like certain snakes and lizards), fish (like some sharks and rays), and some insects exhibit ovoviparity.

The first to evolve is the bony fish which evolved from a jawless fish. The amphibians evolved next after fish. The first amphibians evolved from a lobe-finned fish ancestor about 365 million years ago. They were the first vertebrates to live on land, but they had to return to water to reproduce. For this reason, they had to live near water bodies. They had few characteristics of fish in their early life. The reptiles evolved from the amphibians. They lived completely on land. They laid amniotic eggs and had fertilization. They were the first vertebrates that didn't have to return to water for reproduction. Reptiles developed certain added features such as feathers, hollow bones, and warm bodies. These animals were called birds or Aves. Then mammals. Note: Mammals and birds both evolved from reptiles-like ancestors.

Hint: Use BODMAS, in other words, do multiplication of the second and the last first before subtracting value obtained from the first.

\((\sqrt[3]{64a^{3}})^{-1} = (\sqrt[3]{(4a)^{3}})^{-1}\) = \((4a)^{-1} \) = \(\frac{1}{4a}\)

\(\frac{p^{2} - q^{2}}{2pq} = \frac{(p + q)(p - q)}{2pq}\) = \(\frac{(1 + \sqrt{2} - (1 - \sqrt{2}))(1 + \sqrt{2} + 1 - \sqrt{2})}{2(1 + \sqrt{2})(1 - \sqrt{2})}\) = \(\frac{(2\sqrt{2})(2)}{-2}\) = \(-2\sqrt{2}\)

Total cost = N(250,000 + 70,000) = N320,000 Selling price = N400,000 (given) Gain = SP - CP = N(400,000 - 320,000) = N80,000 Gain % = gain/CP x 100 = (80,000/320,000) x 100 Gain % = 25%

\(x = \frac{y}{2} \) \(\left(\frac{x^{3}}{y^{3}}+\frac{1}{2}\right) \div \left(\frac{1}{2} - \frac{x^{2}}{y^{2}}\right)\) \(\frac{x^3}{y^3} + \frac{1}{2} = (\frac{y}{2})^{3} \div y^{3} + \frac{1}{2}\) = \(\frac{y^{3}}{8} \times \frac{1}{y^3} + \frac{1}{2}\) = \(\frac{1}{8} + \frac{1}{2}\) = \(\frac{5}{8}\) \(\frac{1}{2} - \frac{x^2}{y^2} = \frac{1}{2} - (\frac{y}{2})^{2} \div y^2)\) = \(\frac{1}{2} - \frac{y^2}{4} \times \frac{1}{y^2}\) = \(\frac{1}{2} - \frac{1}{4}\) = \(\frac{1}{4}\) \(\therefore \left(\frac{x^{3}}{y^{3}}+\frac{1}{2}\right) \div \left(\frac{1}{2} - \frac{x^{2}}{y^{2}}\right) = \frac{5}{8} \div \frac{1}{4}\) = \(\frac{5}{2}\)

Principal, P = Amount, A - Interest, I. A = P + I I = (P.T.R)/100 = (P x 5 x 2)/100 = 10P/100 = P/10 But A = P + I, => 5500 = P + (P/10) => 55000 = 10P + P => 55000 = 11P Thus P = 55000/11 = N5,000

\(\frac{(0.14)^{2} \times 0.275}{7(0.02)} = \frac{(0.14)^{2} \times 0.275}{0.14}\) = \(0.14 \times 0.275\) = \(0.0385 \approxeq 0.039\) Note: Embedded zeroes are counted just the same as non-zero digits and For the number of decimal places stated, count that number of digits to the right of the decimal and underline it. The next number to its right is called the 'rounder decider'. If the 'rounder decider' is 5 or more, then round the previous digit up by 1