1. How many sets of chromosomes are in each cell? 2. Which came first, the chick

Question

1. How many sets of chromosomes are in each cell?

2. Which came first, the chicken or the fertilized egg?

3. True or false frogs have internal fertilization

4. What 2 tadpole structures are lost or replaced in adult frogs?

5. In Most animals the placenta replaces ___ which gets rid of waste & provides what gas___?

6. Consider bilateral symmetry which pictures show animals with bilateral symmetry? Choose all apply

7. Each Sperm is unique due to crossing over in __

8. How many chromosomes did your mom give you?

9. How many chromosomes are in 1 sperm?

10. What happens to an egg if it is not fertilized in a few hours?

11. Since Melinda was a ___she has been making eggs

12. The pH of a womens private part is

Explanation / Answer

1.How many sets of chromosomes are in each cell?

Ans:Each cell contains 23 pairs of chromosomes, for a total of 46.

2. Which came first, the chicken or the fertilized egg?

Ans:The fertilized egg has come first as the zygote cell is the only place where DNA mutations could produce a new animal, and the zygote cell is housed in the egg. So, the egg must has come first.

3. True or false frogs have internal fertilization

Ans:False --Frogs have external fertilization as female frog lays the eggs and male covers them with sperm solution so the fertilization takes place externally.

4. What 2 tadpole structures are lost or replaced in adult frogs?

Ans:Tadpoles have these two following structures which are lost or replaced in adults

(i)internal and external gills (ii) flattened tail.

7. Each Sperm is unique due to crossing over in _recombination_

Recombination is a process which mixes up genes passed down by a man's mother or father and this increses genetic diversity.

8.How many chromosomes did your mom give you?

Ans: Mom gives 22+1an X chromosome

9.Sperm which is male sex cell contain only one chromosome

10. What happens to an egg if it is not fertilized in a few hours?

Ans.If an egg is not fertilized in a few hours(about 24hours),the egg disintergates and menstruation period starts two weeks later after the egg breaks.

11. Since Melinda was a 11 year old she has been making eggs

12. The pH of a womens private part is 3.5-4.5

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