genetics i problem areas

Question 1

A child has two X chromosomes. How did this come about?

Answer 1

Segregation of chromosomes during gamete formation

Question 2

When is chromosome number reduced and segregation of homologues takes place?

Answer 2

Meiosis I

Question 3

Each somatic cell of a goat has 60 chromosomes, and nondisjunction occurred for one set of chromosomes. How many chromosomes can be in the goat sperm cell?

Answer 3

31

Question 4

Are cells haploid or diploid at the end of meiosis i?

Answer 4

Diploid

Question 5

Do homologous or sister chromosomes separate during anaphase ii?

Answer 5

Sister chromatids

Question 6

What stage of development has three embryonic germ layers?

Answer 6

Gastrula

Question 7

Which type of stem cell has the potential to become the fewest cell types?

Answer 7

Multipotent

Question 8

What are two characteristics of embryonic stem cells?

Answer 8

They divide by mitosis and can become different types of cells

Question 9

Do homeobox genes control gene transcription in development?

Answer 9

Yes

Question 10

What does the trophoblast and inner cell mass of a blastula become?

Answer 10

The trophoblast becomes the placenta and the inner cel mass becomes the fetus

Question 11

What do HOX genes code fore?

Answer 11

Transcription proteins

Question 12

What is the correct sequence of early embryonic development?

Answer 12

zygote, morula, blastula, gastrula

Question 13

What are worked with in stem cell therapy with patients?

Answer 13

Multipotent cells

Question 14

Are HOX genes in order from head-to-toe on the chromosome?

Answer 14

Yes

Question 15

If the crossing over frequency between two genes is high, how far apart are the genes?

Answer 15

They are close together