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3 years ago

Ryder needs to determine the missing term in this set:

Biology

2 answers:

Bogdan [553]3 years ago

5 0

Answer:

The correct answer is option D. "fertilization".

Explanation:

Human fertilization is defined as the union between a sperm and an egg, which marks the beginning of a new life and the basis of human reproduction. The result of fertilization is the production of a zygote cell, a cell which genome is formed of a combination of both the sperm's and the egg's genome. As could be noted, the term "fertilization" is closely related with the terms "sperm", "egg" and "zygote". Therefore, "fertilization" is the term that best completes the set.

KATRIN_1 [288]3 years ago

4 0

It would be D, fertilization.

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the couple is also concerned about their child inheriting hemophilia, another rare disease, which is x-linked. natalie’s brother

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Hemophilia is a recessive X-linked condition and is inherited from parents. . The probability that Natalie and Daniel’s first child has hemophilia is 1/4, not 1/8. The statement is false.

<h3>What is an X-linked gene?</h3>

When talking about sex-linked genes, we refer to all those genes located in one of the sex-chromosomes and not in the somatic ones.

X-linked genes are the genes located specifically in the X sex chromosome.

Traits coded by these genes are inherited. This is, X-linked genes are transmitted from parents to children through generations.

According to this, X-linked genetic disorders will be inherited as well.

Men have a high probability of being affected since they only have one copy of the X chromosome.

In women, the effect of the mutation might be musk in heterozygous state if the mutation is recessive.

Hemophilia is a recessive X-linked disorder, which means it is coded by the recessive allele.

X+ ⇒ X chrosomosome with Dominant allele

X- ⇒ X chrosomosome with Recessive allele

Genotype Phenotype

X+X+ Healthy woman

X+X- Healthy carrier woman

X-X- Hemophilic woman

X+Y Healthy man

X-Y Hemophilic man

Let us make a pedigree of these families,

Natalie's family:

Mother healthy carrier X+X-

Father healthy X+Y

Brother hemophilic X-Y

Natalie Healthy X+X- or X+X+

Natalie has 1/2 chances of being carrier X+X- and 1/2 of being X+X+.

Daniel's family:

Mother healthy carrier X+X-

Father hemophilic X-Y

Sister hemophilic X-X-

Daniel Healthy X+Y

He has 1/2 chances of being healthy X+Y and 1/2 of being affected X-Y.

According to the product probability rule, if events A and B are independent from each other, the probability of occurrence of both events together is

P(A∩B) = P(A) x P(B)

In this case,

event A is Daniel being affected ⇒ 1/2
event B is Natalie being carrier ⇒ 1/2

P(A∩B) = P(A) x P(B) = 1/2 x 1/2 = 1/4

The probability that Natalie and Daniel’s first child has hemophilia is 1/4, not 1/8. The statement is false.

You can learn more about X-linked genes at

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1 year ago

Most of the coal found on Earth today was formed during the Carboniferous and Permian Periods. About how old could a piece of co

Law Incorporation [45]

Answer: 298.9 million years old

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3 years ago

CHAPTER ONE THE CHEMICAL COMPONENTS OF THE CELL Biology Form Three Student Book

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3 years ago

Pheromones used in reproduction are not likely to be found in organisms that only reproduce?

monitta

Pheromones used in reproduction are not likely to be found in organisms that only reproduce asexually.

The chemicals called pheromones are used to communicate between members of the same species and cause the recipient to react physically or behaviorally. Pheromones are a subset of organisms' larger class of chemicals to communicate, known as semiochemicals, from the Greek semeon, meaning signal or mark.

Animals communicate chemically constantly, with pheromones mediating more interactions than any other type of signal. The majority of pheromone research has been conducted on insects, particularly species that are considered pests.

For these, using pheromones that alter their behaviour in various ways might be employed for population control, pest management, or monitoring.

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1 year ago

List the organelles found in plant cells, in amoeba, and common to both.

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Cytoplasm, ribosomes , nucleus
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3 years ago

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