Question 1

During apoptosis in the feet of chicken embryos, the activation of a single ____________________ causes the cells between the toes to die.

Accepted Answer

The answer of During apoptosis in the feet of chicken...

Question 2

The ovaries produce ____________________ [more or fewer] gametes than the testes.

Accepted Answer

The answer of The ovaries produce ____________________ [more or fewer]...

Question 3

An aquatic animal that relies on currents to bring gametes together is likely to produce ____________________ [more or fewer] gametes than a land animal that deposits its sperm directly within the reproductive tract of a female.

Accepted Answer

The answer of An aquatic animal that relies on currents...

Question 4

When a human embryo is approximately 7 days old, it embeds in the ____________________ of its mother's uterus, where it is nourished by the surrounding blood supply until the placenta is functional.

Accepted Answer

The answer of When a human embryo is approximately 7...

Question 5

During labor more and more oxytocin is produced due to ____________________ feedback.

Accepted Answer

The answer of During labor more and more oxytocin is...

Question 6

The highest teen birthrates are in areas where

Accepted Answer

The highest teen birthrates are in areas where abstinence-only methods of sex education are taught, as these programs do not educate teens on the use of contraception and safe sex practices. Without access to this information, teens are more likely to engage in unprotected sexual activity, resulting in higher rates of teen pregnancy.

Question 7

Organisms that have both functional testes and functional ovaries are known as ____________________.

Accepted Answer

The answer of Organisms that have both functional testes and...

Question 8

The stage in mammalian development when the embryo exists as a hollow, fluid-filled ball is referred to as the ____________________.

Accepted Answer

The answer of The stage in mammalian development when the...

Question 9

The three layers of cells in a human embryo are ectoderm, endoderm, and ____________________.

Accepted Answer

The answer of The three layers of cells in a...

Question 10

In humans development from zygote to completion is ____________________ weeks.

Accepted Answer

The answer of In humans development from zygote to completion...

Question 11

One reason that fertilization rarely occurs between the gametes of two different species might be that the plasma membranes of the gametes of different species do not contain the same ____________________, so the membranes of the sperm and the egg cannot fuse.

Accepted Answer

The answer of One reason that fertilization rarely occurs between...

Question 12

In fruit flies, morphogens

Accepted Answer

Morphogens are signaling molecules that regulate gene expression by switching genes on and off. They play a critical role in the development of multicellular organisms by providing positional information to cells, helping to determine their fate and function. While nucleic acids may be involved in the production or regulation of morphogens, they do not themselves constitute morphogens. Morphogens are also not receptor proteins, though they do bind to and activate specific receptors on target cells. Finally, there is no evidence to suggest that morphogens exist only in eggs; in fact, they are found throughout the body of developing organisms.

Question 13

Different versions of the protein hemoglobin are found in a baby's blood cells at different stages of development. Changes in the hemoglobin type present are most likely the result of

Accepted Answer

The presence of different versions of hemoglobin in a baby's blood cells at different developmental stages is due to changes in gene expression, specifically which genes are transcribed. Different genes are expressed at different stages of development, leading to the production of different types of hemoglobin.

Question 14

Once all the organ systems are developed in a human, about 9 weeks after fertilization, the developing child is considered a(n)____________________.

Accepted Answer

The answer of Once all the organ systems are developed...

Question 15

Which of the following does not affect development in animals?

Accepted Answer

Hemoglobin is a protein found in red blood cells and is responsible for carrying oxygen. It plays no role in animal development, which is primarily influenced by various signaling molecules such as morphogens, genetic factors, and hormones.

Question 16

Spermatogenesis results in the production of ____________________ sperm, whereas oogenesis produces just one egg.

Accepted Answer

The answer of Spermatogenesis results in the production of ____________________...

Question 17

To start a stem cell line from humans, a scientist would want to take a cell from the ____________________ of an embryo.

Accepted Answer

The answer of To start a stem cell line from...

Question 18

In oogenesis, the final steps of meiosis do not occur until ____________________ takes place.

Accepted Answer

The answer of In oogenesis, the final steps of meiosis...

Question 19

Genes are generally switched on or off by the presence of proteins called ____________________.

Accepted Answer

The answer of Genes are generally switched on or off...

Question 20

The graph below shows the normal concentration of morphogens A and B throughout a Drosophila embryo. 
If morphogen B is injected into the head end of an embryo, the embryo is likely to develop

Accepted Answer

The answer of The graph below shows the normal concentration...

Quiz 33: Reproduction and Development