Question

This pedigree chart tracks the inheritance of a recessive trait that is not sex-linked. Based on the information in the chart, which of the following statements is true?



Individual #8 must be heterozygous for the trait.

Individual #10 must be heterozygous for the trait.

Individual #13 must be homozygous dominant.

Individual #3 must be homozygous dominant.

Answer 1

OK we will do it together

Answer 2

kk

Answer 3

First of all to find it you must find the genotype for Individual #1 and 2

Answer 4

k

Answer 5

I was thinking its A...

Answer 6

For individual 1 checkout the key which shows that he is a male who carries a recessive trait right?

Answer 7

yes its a male with a recessive trait

Answer 8

Lets take B for dominant and b for recessive

Answer 9

ok

Answer 10

So the genotype for individual 1 is (bb) because he has a recessive trait.

Answer 11

yea

Answer 12

OK what is the trait for individual 2?

Answer 13

female dominante

Answer 14

spelled dominant wrong :l

Answer 15

So here you have two genotypes which can be dominant which are (BB) and (Bb)

Answer 16

after this I have 1 more then I'm all good for the rest :)

Answer 17

yea

Answer 18

OK to know what is the correct genotype for individual 2 by looking at their children which are individuals 5,6,7 and 8

Answer 19

all dominant traits for 1

Answer 20

all dominant traits for 5 6 7 and 8*

Answer 21

So is the genotype for individual (BB) or (Bb)

Answer 22

ok

Answer 23

So is it (BB) or (Bb)??

Answer 24

BB

Answer 25

No its (Bb)

Answer 26

on the phone...

Answer 27

Try using the Punnet Square between Individual 1 and 2
Individual 1: bb
Individual 2: BB or Bb

Ok so try crossing bb with BB and cross bb with Bb

Answer 28

k

Answer 29

Bb, Bb, BB, bB

Answer 30

This is you crossed bb with BB right?

Answer 31

I'm confused... and yes

Answer 32

So cross bb with Bb and then you will relise that you will get Bb,Bb,Bb and Bb.

Answer 33

NOO sorry

Answer 34

Its my mistake

Answer 35

Its BB and not Bb

Answer 36

ok gotcha

Answer 37

Ok so if you cross bb with BB you will get Bb,Bb,Bb and Bb which are all dominant.
Unlike crossing bb with Bb which will give you Bb,bb,Bb and bb which are half dominant and half recessive right?

Answer 38

yea

Answer 39

hey i gtg in a couple min... were almost there right?

Answer 40

right

Answer 41

alright lets finish this then

Answer 42

OK its written that individual 8 must have a hetrozygous trait true or false?

Answer 43

true

Answer 44

Luckily we found the answer which is the first one since its only asking for statement to be correct and we found it.

Answer 45

alright thanks :)