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Phoenix [80]
3 years ago
9

Fossils show that ancestors of the giraffe had shorter necks than the modern giraffe. The evolution of the modern giraffe may be

an example of ________.
A.
sexual selection
B.
directional selection
C.
disruptive selection
D.
stabilizing selection
Biology
1 answer:
MaRussiya [10]3 years ago
8 0

Answer:

B. Directional selection

Explanation:

When natural selection starts to choose one phenotypes that is an extreme (as in, a really small neck or a really long neck), this is an example of <u>directional selection.</u> It makes sense for giraffes to have evolved this way, because the longer the neck, the more ably they can eat food from high branches. The more food they could get, the more chance of reproduction, the more "evolutionarily fit" they are.

Stabilizing selection is when national selection picks average phenotypes (like a medium-sized neck). Disruptive selection is when the extremes are both picked (like all the medium-sized neck giraffes die, and two different species start to emerge). Sexual selection is picking a mate based on traits. Clearly, those answers don't work here.

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Homologous chromosomes line up in the center of the cell
KonstantinChe [14]

Answer:

Metaphase I

Explanation:

Homologous chromosomes are paired to facilitate crossing over during prophase I of the meiosis I. This is followed by alignment of homologous chromosomes at the equator of the cell during metaphase I. The process is assisted by microtubules of spindle apparatus. The kinetochore microtubules of the spindle apparatus attach themselves to the kinetochores of chromosomes.

The two sister kinetochores of duplicated homologous chromosomes are attached to the opposite pole to align the homologous pair at the center of the cells. Metaphase I is followed by anaphase I during which homologous chromosomes move towards the opposite poles.

5 0
2 years ago
Why can only traits controlled by genes be acted upon by natural selection?
Luda [366]
Traits controlled by genes can only be acted upon natural selection because they have to helpful to the survival of that organism.
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3 years ago
Lizette and her husband had her ova fertilized with his sperm in a laboratory and then implanted in her uterus. what form of ass
RideAnS [48]

In virto fertilization form of assisted reproductive technology.

<h3>IVF: Is the process painful?</h3>

It is comparable to a pap smear or even a vaginal ultrasound appointment. During this technique, an embryo transfer catheter and ultrasound guidance are used to transfer one or more embryos to the uterus. The entire operation will be visible to you on an ultrasound screen. This procedure is painless.

<h3>What distinguishes IVF from in vitro fertilization?</h3>

An IVF procedure involves surgically removing a woman's eggs from her ovaries and fertilizing them in a lab with sperm from a male partner or a sperm donor to produce embryos. (The term "in vitro" refers to the act of fertilizing an egg in a laboratory dish and is derived from the Latin meaning "in glass").

learn more about assisted reproductive technology here

<u>brainly.com/question/8636169</u>

#SPJ4

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At a birthday party, Sam eats a chocolate chip cookie with peanuts. Within minutes, he has trouble breathing, his blood pressure
Setler [38]

allergy to nuts...........

4 0
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A star’s life expectancy depends on its mass. Generally, the more massive the star, the faster it burns up its fuel supply, and the shorter its life. The most massive stars can burn out and explode in a supernova after only a few million years of fusion. A star with a mass like the Sun, on the other hand, can continue fusing hydrogen for about 10 billion years. And if the star is very small, with a mass only a tenth that of the Sun, it can keep fusing hydrogen for up to a trillion years, longer than the current age of the universe.

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