Chapter 4

Question 1

Hemizygous

Answer 1

Having one chromosome or allele

Because males have only one allele for X-linked genes

Recessive traits are expressed more often since males only need one

Question 2

Sex-Linked // X-Linked

Answer 2

1000s of genes on the X, almost nothing on the Y

affects males more than females

Question 3

Sexual Dimorphic Trait

Answer 3

Differentiated expressed genes between sexes // The pattern is a bimodal distribution

Question 4

X-linked Traits can be….

Answer 4

Dominant or Recessive

Question 5

When homologs fail to segregate

Answer 5

= Nondisjunction

• Meiosis II will still occur
• Sister chromatids will fail to segregate in meiosis II (less often)

Question 6

Trisomy - Autosome

Answer 6

One extra chromosome

• EMBRYONIC LETHAL

( EXCEPT FOR Trisomy - 21 = Down syndrome)

Question 7

Monosomy- Autosome

Answer 7

One missing chromosome

• Embryonic Lethal

Question 8

Monosomy Y - Sex chromosome

Answer 8

Embryonic lethal

Question 9

Monosomy X (XO)

Answer 9

turners syndrome

Question 10

Trisomy XXX ( Sex chromosomes)

Answer 10

Triple X syndrome

Question 11

Prokaryotes are…

Answer 11

Haploid

Question 12

Eukaryotes are…..

Answer 12

Diploid (2n)

Alteration of generation.

Question 13

Mitosis

Answer 13

Regular somatic cell divison

• produces clones

Question 14

Meiosis - diploid cells dividing into haploid cells

Answer 14

• products of meiosis = gametes (haploid)
• Products of fertilization = Zygote (diploid)