Lecture 13

Question 1

dihybrid cross

Answer 1

a cross between two individuals in which you are looking at 2 loci on 2 different chromosomes.

Question 2

The law of Independent Assortment

Answer 2

states that during gamete formation, the segregation of one gene pair is independent of all other gene pairs. For this to happen, the loci for the 2 different genes must be on different chromosomes ie the 2 genes (allele) pairs are on nonhomologous chromosomes

Question 3

Dihybrid cross criteria

Answer 3

(1) 2 characters at the same time
(2) 2 true-breeding parents differing in 2 characters
(3) NONHOMOLOGOUS CHROMOSOMES

Question 4

when does the Independent Assortment happen

Answer 4

Metaphase I of meiosis

Question 5

Using Mendel’s law of independent assortment we can:

Answer 5

predict gametes for dihybrids

predict offspring for 2 traits in organisms other than plants

predict offspring for 2 traits in organisms that are not true-breeders

Question 6

how many traits did Mendel study

Answer 6

7

Question 7

What happens when traits (genes) are linked

Answer 7

Linked genes won’t assort independently of each other

LINKED: ON THE SAME CHROMOSOME