Question

in horses, a trotter is dominant over a pacer and black is dominant over brown. What is the genotype of a black trotter whose mother was a brown pacer?

Answer 1

\(\Huge\bf\color{#FF0000}W\color{#FF4900}e\color{#FF9200}l\color{#FFDB00}c\color{#FFff00}o\color{#B6ff00}m\color{#6Dff00}e~\color{#00ff00}t\color{#00ff49}o~\color{#00ffDB}O\color{#00ffff}p\color{#00DBff}e\color{#0092ff}n\color{#0049ff}S\color{#0000ff}t\color{#2400ff}u\color{#6D00ff}d\color{#B600ff}y\color{#FF00ff}!\)

In genetics, the dominant trait is indicated with a capital and a recessive trait is indicated with a lowercase.
So let's say we give the letter q to trotter/pacer and the letter b to black/brown
Now a trotter is dominant over a pacer, so the trotter will be Q and the pacer will be q.
For the color: black is dominant so it will be B, brown is recessive and will be b.

Do you understand it so far?

Answer 2

understood so far

Answer 3

Okay then we'll continue :)

Do you know the difference between homozygous and heterozygous?

Answer 4

Yes homozygous means it has 2 of the same trait like BB or bb and hetero Bb

Answer 5

correct :)
So we have a black trotter. It has the 2 dominant traits so what can be the possible genotype?

Answer 6

QQBB or QqBb ?

Answer 7

yes! very good
Now with this information we can determine the genotype of the father. We know the mother is a brown pacer, those are 2 recessive traits, so the genotype of the mother has to be qqbb.
We can draw a punett square for this.

Can you fill in the rest? use the black box with the pencil in it on in the right upper corner of this drawing

Answer 8

@haseo729 are you still there?

Answer 9

Brown pacer =bt, black trotter =BT, combine these to gives BbTt, which is the required genotype